Lua error table index is nil - Исправление ошибок и поиск оптимальных решений проблем

Neon

В этой теме я научу читать и понимать ошибки, возникающие в коде

~~от криворукости~~

из-за невнимательности.
1. Разбор структуры ошибок. Структура у всех ошибок одинаковая и состоит из названия файла, строки, описания ошибки и трассировки ошибки.
Рассмотрим на примере

Код:

[ERROR] addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua:119: Tried to use a NULL entity!
1. SetModel - [C]:-1
2. SpawnEntity - addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua:119
3. LeftClick - addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua:142
4. unknown - gamemodes/sandbox/entities/weapons/gmod_tool/shared.lua:251

Название файла — где произошла ошибка:

Код:

addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua

Строка ошибки: 119
Описание ошибки: Tried to use a NULL entity!
Трассировка — показывает какие функции и в каких файлах предшествуют нашей ошибке:

Код:

1. SetModel - [C]:-1
2. SpawnEntity - addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua:119
3. LeftClick - addons/ttt weapon placer/lua/weapons/gmod_tool/stools/tttweaponplacer.lua:142
4. unknown - gamemodes/sandbox/entities/weapons/gmod_tool/shared.lua:251

2. Описания ошибок. Чтобы понять как решить задачу, нам надо понять что произошло. В этом нам всегда помогает описание ошибки. Ниже я привожу типичные описания ошибок, наиболее часто встречающихся при разработке. (Список не полный и я буду рад вашим дополнениям)

Tried to use a NULL entity! — означает, что пытаешься использовать несуществующую энтити. Проверь что у тебя в переменной.
Tried to use a NULL physics object! — вызванная энтити пытается быть физичной, но у неё нет модели.
attempt to index global ‘MutantSpawns’ (a nil value) — попытка использовать в коде неинициализированную переменную. Проще говоря, переменная пуста, а к ней происходит обращение.
bad argument #1 to ‘FindByClass’ (string expected, got userdata) — неверный аргумент №1. Там должна быть строка, а получена userdata.
bad argument #1 to ‘pairs’ (table expected, got nil) — тоже неверный аргумент, должна быть таблица, а получено нулевое значение.
bad argument #1 to ‘JSONToTable’ (string expected, got no value) — ещё одна похожая херня, должна быть строка, а получено нулевое значение.
attempt to compare nil with number — сравнение числа и нулевой переменной.
table index is nil — попытка обращения к нулевому элементу.
Couldn’t include file ‘shared.lua’ (File not found) — не найден файл shared.lua
Calling net.Start with unpooled message name! [http://goo.gl/qcx0y] — попытка вызвать функцию net.Start с неизвестным идентификатором. Решается строкой util.AddNetworkString(«ваш идентификатор»)

3. Отсутствие ошибок.
Бывают случаи, когда не понятно почему не запускается сам мод. Такое случается когда в коде происходит фатальная ошибка и мод вообще не загружается. Это можно определить по такой строке:

Код:

Couldn't Load Init Script: 'darkrp/gamemode/init.lua'

В этом случае необходимо проверить последние изменения в коде и отменить их при необходимости. Скорее всего дело в пропущенных скобках, нарушающих синтаксис.

Если же сам мод работает, а не запускается определённые аддоны, то это может быть следствием:

перекрытия кода (переопределение переменных, функций и пр. в этом или другом файле)
файл со скриптом не был подключен
нефатальное нарушение синтаксиса

Последнее редактирование: 7 Янв 2019

Источник

One problem when trying to help people with their Lua problem is that they don’t know how to read Lua errors. You can be 100% sure that saying «it doesn’t work» is absolutely not helpful at all. So I’ll tell you the ways to read Lua errors properly and what it means.

In this post, I used «<>» symbol to denote something arbitrary. Start by reading the syntax of Lua error. Lua error is usually have syntax like this:

<filename>:<lineNumber>: <message>

<filename> is the script file. <lineNumber> is line number where it occured. That’s very easy to remember, right? Now for the error message. The error message is usually very descriptive but sometimes it doesn’t really tell you what exactly is wrong, so here are some lists of Lua errors that I’m aware of. If your Lua error is unlisted, that can mean I didn’t add it yet or it’s thrown by external program.

attempt to call global ‘<name>’ (a <non-function> value)
This caused when you’re trying to call a global variable called ‘<name>’ but ‘<name>’ is not a function type. Example

print() -- works
table() -- attempt to call global 'table' (a table value)
_VERSION() -- attempt to call global '_VERSION' (a string value)
anilvalue() -- attempt to call global 'anilvalue' (a nil value)

attempt to call field ‘<field>’ (a <non-function> value)
Similar to above, but this occurs when you try to call something within a table.
```
-- Note that 'math' is a global variable which is table
math.abs(123) -- works
math.pi() -- attempt to call field 'pi' (a number value)
```

bad argument #<n> to ‘<name>’ (<type1> expected, got <type2>)
This is caused when a function ‘<name>’ expects value with type <type1> for n-th argument, but user passed something with type <type2> instead.

-- io.open expects string for the 1st argument
local file = io.open(io.open) -- bad argument #1 to 'open' (string expected, got function)
-- tonumber 2nd argument expects number if present
tonumber("0xFF") -- works
tonumber("0xFF", table) -- bad argument #2 to 'tonumber' (number expected, got table)

table index is nil
To be honest, this is most undescriptive Lua error message. What it means that you try to assign a value to a table at index «nil» (I mean literal nil).
```
table[nil] = io -- table index is nil
```
bad argument #<n> to ‘<name>’ (invalid option ‘<something>’)
This means you passed invalid option. Notable function that throw this is ‘collectgarbage’ and ‘file:seek’.
```
print(collectgarbage("count")) -- works
collectgarbage("asd") -- bad argument #1 to 'collectgarbage' (invalid option 'asd')
```

So I think that covers most common Lua errors that you mostly encounter. In case you need help, please provide the Lua error message, plus the traceback if available. The traceback is also easy to read, the syntax is similar to above, and it definely helps.

… unless you got a very rare «PANIC» error which is unhelpful. No, really.

Источник

  
  
-- FUNCTIONS / METHODS -- 
  
local cFunc = {};       -- Local Functions  
local cSetting = {};    -- Local Settings 
  
MainMenu_Newgame = {}; 
MainMenu_Newgame.__index = MainMenu_Newgame; 
  
--[[ 
  
]] 
  
-- /////////////////////////////// 
-- ///// New                ////// 
-- ///// Returns: Object    ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:New(...) 
    local obj = setmetatable({}, {__index = self}); 
    if obj.Constructor then 
        obj:Constructor(...); 
    end 
    return obj; 
end 
  
-- /////////////////////////////// 
-- ///// Render             ////// 
-- ///// Returns: Object    ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:Render() 
    if(self.enabled) then 
        self.rm:dxDrawRectangle(439, 254, 1102, 356, tocolor(0, 0, 0, 194), falses) 
        self.rm:dxDrawText(strings.mainmenu.newgame.lobbyname, 449, 264, 536, 295, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawRectangle(439, 227, 1102, 27, tocolor(0, 245, 201, 127), true) 
        self.rm:dxDrawText(strings.mainmenu.newgame.newlobby, 439, 227, 1540, 254, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.password, 449, 313, 536, 344, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.playercount, 797, 264, 884, 295, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.rounds, 449, 407, 536, 438, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.roundlenght, 661, 409, 748, 440, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.seconds, 852, 414, 866, 435, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.map, 1000, 268, 1069, 295, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
        self.rm:dxDrawText(strings.mainmenu.newgame.preview, 894, 305, 976, 473, tocolor(255, 255, 255, 255), 0.2, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
         
        local map = guiGetText(self.guiele.combobox4) 
         
        if(fileExists("files/images/maps/"..map..".jpg")) then 
            self.rm:dxDrawImage(1015, 305, 264, 165, "files/images/maps/"..map..".jpg", 0, 0, 0, tocolor(255, 255, 255, 255), true) 
         
        end 
  
        self.rm:dxDrawRectangle(1279, 553, 246, 48, tocolor(255, 255, 255, 73), true) 
        self.rm:dxDrawText(strings.mainmenu.newgame.startgame, 1282, 553, 1530, 601, getColorFromBool(getElementData(self.guiele.startgame, "hover"), 255, 255, 255, 255, 255, 255, 255, 150), 0.4, fontManager.fonts.agency, "center", "center", false, false, true, false, false) 
    end 
end 
  
-- /////////////////////////////// 
-- ///// AddEvents          ////// 
-- ///// Returns: void      ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:AddEvents() 
    self.startGameFunc = function() 
        local sLobbyName    = guiGetText(self.guiele.edit1); 
        local sPassword     = guiGetText(self.guiele.edit2); 
         
        local iPlayers      = tonumber(guiGetText(self.guiele.combobox1)); 
        local iRounds       = tonumber(guiGetText(self.guiele.combobox2)); 
        local iRoundLenght  = tonumber(guiGetText(self.guiele.combobox3)); 
     
        local sMap          = guiGetText(self.guiele.combobox4); 
         
        local bFriendlyFire = guiCheckBoxGetSelected(self.guiele.checkbox1); 
         
        if(#sLobbyName > 3 and #sPassword > 3 and (iPlayers) and (iRounds) and (iRoundLenght) and #sMap > 1) then 
            triggerServerEvent("onPlayerLobbyCreate", getLocalPlayer(), sLobbyName, sha256(sPassword), iPlayers, iRounds, iRoundLenght, sMap, bFriendlyFire); 
        else 
            messageBox:Show(strings.messagebox.newgame.failTitle, strings.messagebox.newgame.failMessage, strings.messagebox.newgame.failButton, "error", false); 
        end 
     
    end 
     
     
    addEventHandler("onClientGUIClick", self.guiele.startgame, self.startGameFunc) 
     
end 
  
-- /////////////////////////////// 
-- ///// BuildGui           ////// 
-- ///// Returns: void      ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:BuildGui() 
    self.guiele.checkbox1   = self.rm:guiCreateCheckBox(449, 457, 152, 34, "Friendly fire", true, false) 
    self.guiele.edit1       = self.rm:guiCreateEdit(553, 264, 205, 35, "", false) 
    self.guiele.edit2       = self.rm:guiCreateEdit(553, 309, 205, 35, "", false) 
     
    self.guiele.startgame   = self.rm:guiCreateButton(1279, 553, 1530-1279, 601-553, "", false, nil, true, rstrings.sounds.buttons.hover, rstrings.sounds.buttons.click); 
    guiSetAlpha(self.guiele.startgame, 0) 
     
    self.guiele.combobox1   = self.rm:guiCreateComboBox(894, 271, 77, 212, "", false) 
    for index, val in ipairs(self.players) do guiComboBoxAddItem(self.guiele.combobox1, val) end; 
     
     
    self.guiele.combobox2   = self.rm:guiCreateComboBox(553, 413, 79, 211, "", false) 
    for index, val in ipairs(self.rounds) do guiComboBoxAddItem(self.guiele.combobox2, val) end; 
     
     
    self.guiele.combobox3   = self.rm:guiCreateComboBox(768, 414, 79, 215, "", false) 
     
    for index, val in ipairs(self.roundLenght) do guiComboBoxAddItem(self.guiele.combobox3, val) end; 
     
     
    self.guiele.combobox4   = self.rm:guiCreateComboBox(1069, 272, 156, 271, "", false) 
    for index, val in ipairs(self.maps) do guiComboBoxAddItem(self.guiele.combobox4, val) end; 
     
    self:AddEvents(); 
     
    for index, ele in pairs(self.guiele) do 
        if(self.guitext[index]) then 
            guiSetText(ele, self.guitext[index]) 
        end 
     
        guiSetFont(ele, fontManager.guiFonts.agency) 
    end 
end 
  
-- /////////////////////////////// 
-- ///// DestroyGui         ////// 
-- ///// Returns: void      ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:DestroyGui() 
    for index, ele in pairs(self.guiele) do 
        self.guitext[index] = (guiGetText(ele) or false) 
        destroyElement(ele); 
    end 
end 
-- /////////////////////////////// 
-- ///// Toggle             ////// 
-- ///// Returns: void      ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:Toggle() 
    if(self.enabled) then 
        self.enabled = false; 
        self:DestroyGui(); 
    else 
        self.enabled = true; 
        self:BuildGui(); 
    end 
end 
  
  
-- /////////////////////////////// 
-- ///// Constructor        ////// 
-- ///// Returns: void      ////// 
-- /////////////////////////////// 
  
function MainMenu_Newgame:Constructor(...) 
    -- Instanzen 
    self.guiele         = {}; 
    self.guitext        = {}; 
    self.enabled        = false; 
    self.rm             = RenderManager:New(g.aesx, g.aesy); 
     
    self.players        = {2, 4, 6, 8, 10, 12, 14, 16, 32, 64, 128, 256}; 
    self.rounds         = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 40, 80, 160, 240}; 
    self.roundLenght    = {30, 60, 90, 120, 240, 480}; 
    self.maps           = {"prophunt-airport"}; 
  
     
    -- Funktionen 
  
     
    -- Events 
     
    outputDebugString("[CALLING] MainMenu_Newgame: Constructor"); 
end 
  
-- EVENT HANDLER --

Источник

11-21-20, 07:04 PM

A Murloc Raider

Join Date: Nov 2020

Posts: 7

table index is nil

Hi, I have been trying to fix this addon and my knowledge of lua is limited at best. It still works, but throws an error first time it’s called then is fine. It started throwing the error in pre-patch shadowlands. And thank you in advance for help to fix this.

This is the lua error …

Date: 2020-10-12 12:58:10
ID: 1
Error occured in: Global
Count: 1
Message: ..AddOnsBattleDexBattleDex.lua line 69:
table index is nil
Debug:
[string «@BattleDexBattleDex.lua»]:69: RecordPet()
[string «@BattleDexBattleDex.lua»]:61: RecordBattle()
[string «@BattleDexBattleDex.lua»]:34:
BattleDexBattleDex.lua:23
Locals:
species = nil
level = 1
quality = 1
primary = 379
(*temporary) = <table> {
440 = <table> {
}
441 = <table> {
}
442 = <table> {
}
387 = <table> {
}
417 = <table> {
}
419 = <table> {
}
1162 = <table> {
}
675 = <table> {
}
437 = <table> {
}
378 = <table> {
}
424 = <table> {
}
379 = <table> {
}
}
(*temporary) = <table> {
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = nil
(*temporary) = «table index is nil»

It only has 2 files, a TOC and Lua file
TOC file — The only thing I’ve changed in here is the Interface number

Code:

## Interface: 90001
## Title : BattleDex
## Notes: Track Pet Battles
## Author: Cal Henderson (Bees on Hyjal-US)
## Version: 1.1
## Dependencies: 
## SavedVariablesPerCharacter: BattleDexPrefs
## SavedVariables: BattleDexDB

BattleDex.lua

Lua file

Code:

BattleDex = {};
BattleDex.default_options = {
};

function BattleDex.OnReady()

	-- init database
	_G.BattleDexDB = _G.BattleDexDB or {};
	_G.BattleDexDB.pets = _G.BattleDexDB.pets or {};

	-- set up default options
	_G.BattleDexPrefs = _G.BattleDexPrefs or {};
	local k,v;
	for k,v in pairs(BattleDex.default_options) do
		if (not _G.BattleDexPrefs[k]) then
			_G.BattleDexPrefs[k] = v;
		end
	end

	GameTooltip:HookScript("OnTooltipSetUnit", BattleDex.AlterTooltip);
end

function BattleDex.OnEvent(frame, event, ...)

	if (event == 'ADDON_LOADED') then
		local name = ...;
		if name == 'BattleDex' then
			BattleDex.OnReady();
		end
		return;
	end

	if (event == 'PET_BATTLE_OPENING_DONE') then
		BattleDex.RecordBattle();
	end
end

function BattleDex.RecordBattle()

	if (not C_PetBattles.IsWildBattle()) then
		return;
	end

	-- get pet info

	local s1 = C_PetBattles.GetPetSpeciesID(2, 1);
	local s2 = C_PetBattles.GetPetSpeciesID(2, 2);
	local s3 = C_PetBattles.GetPetSpeciesID(2, 3);

	local l1 = C_PetBattles.GetLevel(2, 1);
	local l2 = C_PetBattles.GetLevel(2, 2);
	local l3 = C_PetBattles.GetLevel(2, 3);

	local r1 = C_PetBattles.GetBreedQuality(2, 1);
	local r2 = C_PetBattles.GetBreedQuality(2, 2);
	local r3 = C_PetBattles.GetBreedQuality(2, 3);

	-- record each pet

	BattleDex.RecordPet(s1, l1, r1, 0);
	BattleDex.RecordPet(s2, l2, r2, s1);
	BattleDex.RecordPet(s3, l3, r3, s1);
end

function BattleDex.RecordPet(species, level, quality, primary)

	--print(string.format("s=%d, l=%d, q=%d, p=%d", species, level, quality, primary));

	_G.BattleDexDB.pets[species] = _G.BattleDexDB.pets[species] or {};

	local key = primary.."_"..level.."_"..quality;

	_G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] or 0;
	_G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] + 1;
end

function BattleDex.AlterTooltip()

	local _, unit = GameTooltip:GetUnit();
        if (not unit) then return; end;
	if (not UnitIsWildBattlePet(unit)) then return; end;

	local species = UnitBattlePetSpeciesID(unit);

	-- is this pet in our DB at all?
	if (not _G.BattleDexDB.pets[species]) then
		GameTooltip:AddLine("|cFF9999FFNever battled");
		GameTooltip:Show();
		return;
	end

	-- make a new data structure of [primary -> {quality: count, quality:count}]
	local counts = {};
	local k,v;
	for k,v in pairs(_G.BattleDexDB.pets[species]) do
		local itr = string.gmatch(k, "%d+");
		local pri = tonumber(itr());
		local lvl = tonumber(itr());
		local qul = tonumber(itr());

		--GameTooltip:AddLine(string.format("%d / %d / %d", pri, qul, v));

		counts[pri] = counts[pri] or {};
		counts[pri][qul] = counts[pri][qul] or 0;
		counts[pri][qul] = counts[pri][qul] + v;
	end

	-- colors
	local _, _, _, col0 = GetItemQualityColor(0);
	local _, _, _, col1 = GetItemQualityColor(1);
	local _, _, _, col2 = GetItemQualityColor(2);
	local _, _, _, col3 = GetItemQualityColor(3);

	-- output
	for k,v in pairs(counts) do
		local pri = k;
		local num1 = v[1] or 0;
		local num2 = v[2] or 0;
		local num3 = v[3] or 0;
		local num4 = v[4] or 0;

		local nums = string.format("|c%s%d|r/|c%s%d|r/|c%s%d|r/|c%s%d|r", col0,num1,col1,num2,col2,num3,col3,num4);

		if (pri == 0) then
			GameTooltip:AddLine("Primary: "..nums);
		else
			local name = C_PetJournal.GetPetInfoBySpeciesID(pri);
			GameTooltip:AddLine(name..": "..nums);
		end
	end

	GameTooltip:Show();
end


-- ############################# Slash Commands #############################

SLASH_BattleDex1 = '/bd';
SLASH_BattleDex2 = '/battledex';

function SlashCmdList.BattleDex(msg, editBox)
end

-- ############################# Event Frame #############################

BattleDex.EventFrame = CreateFrame("Frame");
BattleDex.EventFrame:Show();
BattleDex.EventFrame:SetScript("OnEvent", BattleDex.OnEvent);
BattleDex.EventFrame:SetScript("OnUpdate", BattleDex.OnUpdate);
BattleDex.EventFrame:RegisterEvent("ADDON_LOADED");
BattleDex.EventFrame:RegisterEvent("PET_BATTLE_OPENING_DONE");

11-21-20, 07:16 PM

I did that?

Join Date: Dec 2011

Posts: 1,609

Try moving OnReady from ADDON_LOADED to PLAYER_LOGIN. Your SavedVariables will have been loaded by the game when this event fires and it only fires once.

Don’t forget to remove your old SV .lua file(s) before trying.

Lua Code:

function BattleDex.OnReady()
-- init database



  


                       
  



if not BattleDexDB then
        BattleDexDB = {
            pets = {},
}
end
if not BattleDexPrefs then
        BattleDexPrefs = {}
for k,v in pairs(BattleDex.default_options) do
if not BattleDexPrefs[k] then
                BattleDexPrefs[k] = v



  


                       
  



end
end
end
    GameTooltip:HookScript("OnTooltipSetUnit", BattleDex.AlterTooltip);
end
function BattleDex.OnEvent(frame, event, ...)
if (event == 'PLAYER_LOGIN') then
        BattleDex.OnReady();
end
if (event == 'PET_BATTLE_OPENING_DONE') then



  


                       
  



        BattleDex.RecordBattle();
end
end
-- ...
BattleDex.EventFrame:RegisterEvent("PLAYER_LOGIN");
BattleDex.EventFrame:RegisterEvent("PET_BATTLE_OPENING_DONE");

Last edited by Fizzlemizz : 11-21-20 at 07:43 PM.

11-21-20, 09:00 PM	#3
A Pyroguard Emberseer Join Date: Jul 2006 Posts: 2,215	SavedVars should be ready by the time ADDON_LOADED fires. It’s part of the addon loading process. The error isn’t complaining about the table itself being *nil, there’s a different error for that. The problem is when you use nil* as a key. The code only works if the opponent has 3 battle pets. If they don’t have a full team, this error occurs. One or more empty spots causes *species* in BattleDex.RecordPet() (along with most of the other arguments) to be *nil*. This is what the error means by «table index is nil». Again, if this was a load issue with the SavedVar, this would be «attempt to index nil» instead. It’s a common mistake to confuse these two. __________________ WoWInterface AddOns «All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools.» -Anders (Dragon Age: Origins — Awakening)

11-21-20, 11:08 PM	#4
A Murloc Raider Join Date: Nov 2020 Posts: 7	Thank you for your help. I changed to your code, still get the error, slightly different, but same error, when starting the first battle, and it doesn’t record the first battle, but does record later battles. I removed the SV before I went in game. I have a full team, but the wild pets don’t always, testing in Darnassus where pets are single, low level. I’m fairly sure it was throwing the error on 3 wild pets, full team, too, but will go test the theory. … Theory tested, and No, no error when starting with wild pets that have a full team with changed lua file. Also tested my original lua file and no it doesn’t error with the other team being full either. Both versions of lua recorded the first battle.

11-21-20, 11:46 PM	#5
A Pyroguard Emberseer Join Date: Jul 2006 Posts: 2,215	That’s the spot it’s complaining about. Line 69 in function BattleDex.RecordPet(). The only line there that would generate that error (there are other operations like it, but it would throw a different error generating the second key) is this. Code: _G.BattleDexDB.pets[species] = _G.BattleDexDB.pets[species] or {}; The error is specifically saying *species* is *nil. PS: The theory was about the enemy team having less than* 3 pets. The only other explanation is if BattleDex.RecordBattle() is running before pet data is available. __________________ WoWInterface AddOns «All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools.» -Anders (Dragon Age: Origins — Awakening)

11-22-20, 12:42 AM	#6
A Murloc Raider Join Date: Nov 2020 Posts: 7	So is there a way I can get it to realize that when the pet doesn’t exist it’s 0, zero, not nil? or that it’s ok that the pet doesn’t exist? and just record the existing pet/s a couple of lines down it tells it to either record/add 0 or 1 I’m presuming that’s not enough? Code: _G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] or 0; _G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] + 1;

11-22-20, 11:32 AM

A Cliff Giant

Join Date: Jun 2020

Posts: 73

Option 1: Add a safeguard to RecordPet() so that it doesn’t try to execute when information is missing.

Lua Code:

function BattleDex.RecordPet(species, level, quality, primary)
if (species) then
--print(string.format("s=%d, l=%d, q=%d, p=%d", species, level, quality, primary));
_G.BattleDexDB.pets[species] = _G.BattleDexDB.pets[species] or {};
local key = primary.."_"..level.."_"..quality;
_G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] or 0;
_G.BattleDexDB.pets[species][key] = _G.BattleDexDB.pets[species][key] + 1;
end



  


                       
  



end

Option 2: Change RecordBattle() so it is smart enough to know you sometimes have fewer than three pets.

I think you can do it using C_PetBattles.GetNumPets() but its probably also doable with a simple if (s2) then … end

Lua Code:

function BattleDex.RecordBattle()
if (not C_PetBattles.IsWildBattle()) then
return;
end
-- first pet
local s1 = C_PetBattles.GetPetSpeciesID(2, 1);



  


                       
  



local l1 = C_PetBattles.GetLevel(2, 1);
local r1 = C_PetBattles.GetBreedQuality(2, 1);
    BattleDex.RecordPet(s1, l1, r1, 0); -- 4th arg means self is primary
-- second pet
if (C_PetBattles.GetNumPets(2) >= 2) then
local s2 = C_PetBattles.GetPetSpeciesID(2, 2);
local l2 = C_PetBattles.GetLevel(2, 2);     
local r2 = C_PetBattles.GetBreedQuality(2, 2);
        BattleDex.RecordPet(s2, l2, r2, s1);    -- 4th arg points to first pet
end



  


                       
  



-- third pet
if (C_PetBattles.GetNumPets(2) >= 3) then
local s3 = C_PetBattles.GetPetSpeciesID(2, 3);
local l3 = C_PetBattles.GetLevel(2, 3);
local r3 = C_PetBattles.GetBreedQuality(2, 3);  
        BattleDex.RecordPet(s3, l3, r3, s1);    -- 4th arg points to first pet
end
end

Last edited by DahkCeles : 11-23-20 at 04:48 PM.
Reason: «then» on line 22

11-22-20, 01:21 PM	#8
A Murloc Raider Join Date: Nov 2020 Posts: 7	Awesome, I went with option 2. It errored on login, but putting ‘then’ on line 22 fixed that, and it’s now recording the low level pets without error. Thank you very much everyone for your help

11-22-20, 05:47 PM

A Pyroguard Emberseer

Join Date: Jul 2006

Posts: 2,215

I’d honestly convert it to a loop.

Lua Code:

function BattleDex.RecordBattle()
if not C_PetBattles.IsWildBattle() then return; end
local primary=0;
for i=1,C_PetBattles.GetNumPets(2) do



  


                       
  



local species=C_PetBattles.GetPetSpeciesID(2,i);
        BattleDex.RecordPet(
            species
            ,C_PetBattles.GetLevel(2,i)
            ,C_PetBattles.GetBreedQuality(2,i)
            ,primary--  Passes zero for the first iteration
);
if i==1 then primary=species; end-- Sets the primary species for following iterations
end
end

__________________
WoWInterface AddOns

«All I want is a pretty girl, a decent meal, and the right to shoot lightning at fools.»

-Anders (Dragon Age: Origins — Awakening)

Источник

Are you having trouble to understand the error that Lua (CS2D console) gives to you? Fear not because user Dousea is here for you! This thread is going to explain what errors you’d expect while scripting. Note that maybe not all errors have been identified by me so please.. contact if you find anything. Enough with the useless chit-chat, let’s go to the fun part.

Just a note, use CTRL+F to find your error here.

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

General Syntax
These are the errors that are commonly given for general syntax error.

Keep in mind

that you either forgot or accidentally inserted a word or a symbol that doesn’t match with Lua’s syntax.

Quote:

‘X’ expected near ‘Y’

: a word or a symbol.

Lua is expecting

near

Code:

if (not a)
a = {true} — ‘then’ expected near ‘a’
end

print(a][1]) — ‘)’ expected near ‘]’

Quote:

‘X’ expected (to close ‘Z’ at line W) near ‘Y’

: line that contains

: a word or a symbol.

Lua is expecting

near

to close

at line

Code:

if (true) then
print(«it’s true!») — ‘end’ expected (to close ‘if’ at line 1) near ‘<eof>’

Quote:

unexpected symbol near ‘X’

: a word or a symbol.

Lua is not expecting any symbol near

Code:

print(«a»)) — unexpected symbol near ‘)’

Quote:

malformed number near ‘X’

: a word or a symbol.

There’s malformed number near

. You either try to concatenate a literal number with strings without brackets or accidentally inserted a word or a symbol after a number.

Code:

print(1..»st») — malformed number near ‘1..’

Quote:

unfinished string near ‘X’

: a word or a symbol.

You forgot to finish a string near

Code:

print(«I forgot to close this string) — unfinished string near ‘<eof>’

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Arithmetic
Arithmetic operation is a weakness for some scripters. These are the errors for arithmetic operations failures.

Keep in mind

that Lua provides automatic conversion for strings to numbers whenever a number is expected. Arithmetic only can be performed with numbers, and strings with following condition: only numerical constant inside the string, no other char.

Quote:

attempt to perform arithmetic on Y ‘X’ (a Z value)

: variable that is attempted to be performed with arithmetic.

: either

local

global

, or

field

, based on

: either

nil

boolean

number

string

function

userdata

thread

, or

table

, based on

You’re trying to perform arithmetic on

, while

is a

value that couldn’t perform any arithmetic.

Code:

a = {}
b = «b»

print(a — 0) — attempt to perform arithmetic on global ‘a’ (a table value)
print(4 / b) — attempt to perform arithmetic on global ‘b’ (a string value)

Quote:

attempt to perform arithmetic on a X value

: either

nil

boolean

number

string

function

userdata

thread

, or

table

You’re trying to perform arithmetic on a literal or table value that couldn’t perform any arithmetic.

Code:

a = {}
a[10] = «string»

print(a[10] — 1) — attempt to perform arithmetic on a string value
print(«1» % {}) — attempt to perform arithmetic on a table value

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Concatenation
These are the errors that given when a concatenation error occured. Concatenation is only for strings and numbers.

Keep in mind

that Lua automatically converts numbers to strings whenever a string expected. Therefore, string concatenation accepts numbers besides strings.

Quote:

attempt to concatenate Y ‘X’ (a Z value)

: variable that is attempted to be concatenated.

: either

local

global

, or

field

, based on

: either

nil

boolean

number

string

function

userdata

thread

, or

table

, based on

You’re trying to concatenate

, while

is a

value that is unconcatenatable.

Code:

a = {}

print(a .. » is a table») — attempt to concatenate global ‘a’ (a table value)
print(«a.b = » .. a.b) — attempt to concatenate field ‘b’ (a nil value)

Quote:

attempt to concatenate a X value

: either

nil

boolean

number

string

function

userdata

thread

, or

table

You’re trying to concatenate a literal or table value that is unconcatenatable.

Code:

a = {}

print(«Can I concatenate » .. true .. «?») — attempt to concatenate a boolean value
print(«a[1] = » .. a[1]) — attempt to concatenate a nil value

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Length Operator
Errors of these are given because you’re messing with length operator that’s denoted by

tag.

Keep in mind

that values that have length are strings and tables. The length of a string is its number of bytes (each character is one byte), while the length of a table is only permitted if the table is a sequence, a set of its keys are all numeric and equal to {1..n} where n is a non-negative integer (n is its length).

Quote:

attempt to get length of Y ‘X’ (a Z value)

: variable that is attempted to get its length.

: either

local

global

, or

field

, based on

: either

nil

boolean

number

string

function

userdata

thread

, or

table

, based on

You’re trying to get the length of

, while

is a

value that doesn’t have any sort of length.

Code:

print(#a) — attempt to get length of global ‘a’ (a nil value)

Quote:

attempt to get length of a X value

: either

nil

boolean

number

string

function

userdata

thread

, or

table

You’re trying to get length of a literal or table value that doesn’t have any sort of length.

Code:

a = {}
a[97] = false

print(#nil) — attempt to get length of a nil value
print(#a[1]) — attempt to get length of a boolean value

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Table Index
These are the errors for table indexing.

Keep in mind

that all variables can act as keys in tables, but only two literal values can act as ones, number and string.

Quote:

attempt to index Y ‘X’ (a Z value)

: variable that is attempted to be indexed.

: either

local

global

, or

field

, based on

: either

nil

boolean

number

string

function

userdata

thread

, or

table

, based on

You’re trying to index

, while

is a

value that couldn’t be indexed.

Code:

a = io.open(«test.txt»)

print(a[1]) — attempt to index global ‘a’ (a userdata value)
print(b.b) — attempt to index global ‘b’ (a nil value)

Quote:

attempt to index a X value

: either

nil

boolean

number

string

function

userdata

thread

, or

table

You’re trying to index a literal or table value that couldn’t be indexed.

Code:

a = {}
a[98] = true

print(a[1].index) — attempt to index a boolean value
print((«a»)[1]) — attempt to index a string value

You’re trying to set a value to nil index of a table.

Code:

a[nil] = true — table index is nil

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

Function Calls
These errors are given to you if you’re doing something weird with function calls.

Keep in mind

that function calls are only for, well, functions. Built-in functions give you an error if you’re trying to send invalid arguments.

Quote:

attempt to call Y ‘X’ (a Z value)

: variable that is attempted to be called.

: either

local

global

, or

field

, based on

: either

nil

boolean

number

string

function

userdata

thread

, or

table

, based on

You’re trying to call

, while

is a

value that couldn’t be called.

Code:

print(a()) — attempt to call global ‘a’ (a nil value)

Quote:

attempt to call a X value

: either

nil

boolean

number

string

function

userdata

thread

, or

table

You’re trying to call a literal or table value that couldn’t be called.

Code:

a = {}
a.ortimh = «user»

a.ortimh() — attempt to call a string value
io.openfile(«file») — attempt to call a nil value

Quote:

bad argument #X to ‘Z’ (Y expected)

: position of the argument.

: either

nil

boolean

number

string

function

userdata

thread

table

, or

value

: a word or a symbol.

You’re trying to send an invalid value at argument position #

function while argument #

of the function is expecting

Code:

a = {}
b = setmetatable(a, «__add») — bad argument #2 to ‘setmetatable’ (nil or table expected)

Quote:

bad argument #X to ‘W’ (Y expected, got Z)

: a word or a symbol.

: position of the argument.

: either

nil

boolean

number

string

function

userdata

thread

table

, or

value

: either

nil

boolean

number

string

function

userdata

thread

table

, or

no value

You’re trying to send

at argument position #

function while argument #

of the function is expecting

Code:

print(table.concat()) — bad argument #1 to ‘concat’ (table expected, got no value)

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

You’ve read one, or some, or all of the errors meanings. These are several statements/questions that may lurk in your head currently.

I don’t understand these errors meanings.
Sorry for the inconvenience. I’m trying to give the best-short explanation for you to understand it better without useless words being used. Errors that Lua give are pretty explanatory.

I always get «attempt to concatenate a boolean value» error while I don’t have any boolean value?
Maybe you’re trying to send invalid arguments to CS2D functions such as player, thus resulting a false value.

Flacko has written:

Some cs2d functions such as player() return false on error (wrong parameter or invalid player ID)

Here’s an example of how this error can occur:

Code:

function joinhook(id)
msg2(id, «Welcome, » .. player(id — 1, «name») .. «!@C») — attempt to concatenate a boolean value, if id = 1
end

addhook(«join», «joinhook»)

I’m getting «attempt to call a nil value» every X, without giving me which file that causes the error!
Maybe that’s because you’re adding a hook while the function you add to the hook is nil or not exist. You either need to delete the «adding hook» part or create a function for that hook. Here’s an example of how this error can occur:

Code:

function joinhook(id)
msg2(id, «Welcome, » .. player(id, «name») .. «!@C»)
end

addhook(«join», «welcomehook») — attempt to call a nil value

What do ?, <eof> and <name> mean?
? means unknown, <eof> means end of file, and <name> could mean a lot such as identifier.

Let’s hope that you find your solutions to your problems!

edited 11×, last 07.07.16 01:41:40 pm

I’m awesome … and I really like cookies.

Источник

I tried setting up lsp-status according to the example config in the readme but once my lsp loads I get an error (also see #9 (comment) who seems to be having the same issue):

Error executing vim.schedule lua callback: .../start/lsp-status.nvim/lua/lsp-status/util.lua:62: table index is nil

My lsp/lsp-status config is here. It’s basically the lsp-status config from the readme but integrated into the default config from lspconfig.

-- setup lsp status
local lsp_status = require('lsp-status')
lsp_status.config({
})
lsp_status.register_progress()

local nvim_lsp = require('lspconfig')

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
  local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
  local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

  -- Enable completion triggered by <c-x><c-o>
  buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

-- key bindings

-- lsp_status
  lsp_status.on_attach(client)
end

-- Use a loop to conveniently call 'setup' on multiple servers and
-- map buffer local keybindings when the language server attaches
local servers = { 'julials' }
for _, lsp in ipairs(servers) do
  nvim_lsp[lsp].setup {
    on_attach = on_attach,
    capabilities = lsp_status.capabilities,
    flags = {
      debounce_text_changes = 150,
    }
  }
end

From looking at the lsp-status source my guess is that id is never set but I can’t figure out why.

I have the same issue with a similar config, have you found a fix yet?

Nope, I can’t use this plugin until it’s fixed unfortunuately.

…

On Fri, Dec 03, 2021 at 12:14:05AM -0800, scrouthtv wrote:
I have the same issue with a similar config, have you found a fix yet?

—
You are receiving this because you authored the thread.
Reply to this email directly, view it on GitHub, or unsubscribe.*

Sorry for neglecting to get to this for so long. I’ve been unable to reproduce this issue with your config — do you see this error with servers other than JuliaLS, or just that server?

Also, if you’re willing to help debug this, could you please try putting print calls with unique messages at the calls to util.ensure_init in lsp_status.messaging.register_client and lsp_status.messaging.progress_callback, so that we can narrow down where the nil value is occurring?

I’m also not able to reproduce this issue anymore. I tried some things in my config, I guess the order in which plugins are loaded is relevant. The plugin is currently working for me.

yes, it’s working for me too now! lightline doesn’t seem to support animations but that’s fine.

Источник

i1abnrk: Member; Posts: 20; Joined: Sat May 11, 2013 03:20; GitHub:
i1abnrk; IRC: i1abnrk; In-game: mervyncoll; Location: Wisconsin; Contact:

lua help: nil, table expected [solved]

I have a lua error and I kEep trying to iron this out but my point (voxel) is nil when I try to pass it to the function in a mapgen. Here’s the code. I need a fresh pair of eyes to spot the problem.

Code: Select all

minetest.register_on_generated(function(minp, maxp, seed)
    local limit={
        XMIN = -33000,
        XMAX = 33000,
        YMIN = 3000,
        YMAX = 5000,
        ZMIN = -33000,
        ZMAX = 33000,
    }
    
    local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
    local grid = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
    local data = vm:get_data()
    
    function get_matter(point)
        return minetest.get_node(point).name
    end
    
    function get_depth(point)
        local y0 = limit.YMIN
        local y1 = limit.YMAX
        local y = y0
        local pi = point
        while y <= y1 do
            if get_matter(pi) == "air" then 
                return y
            end
            y = y + 1
            pi = above(pi)
        end
        return y1
    end
    
    function set_matter(point, material)
        data[grid:indexp(point)]=minetest.get_content_id(material)
    end
    
    function incrementY(point)
        local currentValue = math.floor(get_depth(point)) + 1
        if (currentValue >= limit.YMAX) then
            return
        else
            set_matter(point, "default:stone")
        end
    end
    
    function below(point)
        return {x=point.x,y=point.y-1,z=point.z}
    end

    function above(point)
        return {x=point.x,y=point.y+1,z=point.z}
    end

    function north(point)
        return {x=point.x,y=point.y,z=point.z-1}
    end

    function south(point)
        return {x=point.x,y=point.y,z=point.z+1}
    end

    function east(point)
        return {x=point.x-1, y=point.y, z=point.z}
    end

    function west(point)
        return {x=point.x+1, y=point.y, z=point.z}
    end

    function adjacent(point)
        return {point, above(point), below(point), north(point), south(point), east(point), west(point)}
    end
    
    function level_neigh(point)
        local neighbors = {point, north(point), south(point), east(point), west(point)}
        return neighbors
    end
    
    function sumOfNeighbors(point)
        local sum = 0
        for ni = 0, #level_neigh(point) do
            local nb=level_neigh(point)[ni]
            sum = sum + get_depth(nb)
        end
        return sum
    end
    
    function countNeighborsOnLevel(point)
        local sum = 0
        for ni = 0, #level_neigh(point) do
            local nb=level_neigh(point)[ni]
            if get_depth(point)==get_depth(nb) then
                sum = sum + 1
            end
        end
        return sum
    end
    
    function addOneHere(point) 
        local seed = math.random()
        local chance_constant=0.04
        local plant = 0
        local sn = sumOfNeighbors(point)
        local cl = countNeighborsOnLevel(point)
        local chanceModifier = (1.0+(chance_constant * sn)) ^ cl
        plant = seed * chanceModifier
        return plant
    end
    
    function generate_chunk()
        local x0 = emin.x
        local x1 = emax.x
        local y0 = emin.y
        local z0 = emin.z
        local z1 = emax.z
        for dz = z0, z1 do
            for dx = x0, x1 do
                local vi = grid:index(dx, y0, dz)
                local point = grid:position(vi)
                if addOneHere(point) >= 1.0 then
                    incrementY(point)
                end
            end
        end
    end
    
    generate_chunk()
    
    vm:set_data(data)
vm:set_lighting({day=0, night=0})
vm:calc_lighting()
vm:update_liquids()
vm:write_to_map(data)
vm:update_map()
end)

Thanks, guys. Again, I’m nil hunting here. Might I suggest a separate thread for Lua questions?

Last edited by i1abnrk on Sun Feb 16, 2014 15:41, edited 1 time in total.

i1abnrk: Member; Posts: 20; Joined: Sat May 11, 2013 03:20; GitHub:
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by i1abnrk » Sun Feb 16, 2014 10:19

Post

The stack trace starts at get_matter(point) with «attempting to index a nil» meaning x, y or z properties are not being set from VoxelArea:position or is being changed to a nil by my code.

Last edited by i1abnrk on Sun Feb 16, 2014 10:24, edited 1 time in total.

rubenwardy: Moderator; Posts: 6805; Joined: Tue Jun 12, 2012 18:11; GitHub:
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by rubenwardy » Sun Feb 16, 2014 11:34

Post

i1abnrk: Member; Posts: 20; Joined: Sat May 11, 2013 03:20; GitHub:
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by i1abnrk » Sun Feb 16, 2014 13:39

Post

No, that doesn’t work. I use the correct form of the get_node method according to the developer wiki. It seems to be nil from the generate_chunk function but it looks correct to me. Somewhere, I’m referencing and passing another value like perhaps the index instead of the table.

Last edited by i1abnrk on Sun Feb 16, 2014 13:45, edited 1 time in total.

Krock: Developer; Posts: 4630; Joined: Thu Oct 03, 2013 07:48; GitHub:
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by Krock » Sun Feb 16, 2014 14:36

Post

1) take your «limit» table outside of the function
2) take the other function in that function outside
3) test it
4) exact error messages increase your chance for getting help

Last edited by Krock on Sun Feb 16, 2014 14:37, edited 1 time in total.

i1abnrk: Member; Posts: 20; Joined: Sat May 11, 2013 03:20; GitHub:
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by i1abnrk » Sun Feb 16, 2014 15:40

Post

Ok, tables are 1-based and I had written 0-based loops in my sum functions. Yay for the print function. Functions in functions work fine for me and make my code cleaner. Moving things around though gave me the idea to generate debug output. (Duh-copter.) Thanks for the impetus, Krock.

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