Attempt to perform arithmetic on field 'x' (a nil value)

[ClownTech]

I've made a mod which uses widgets and after attempting to set x and y values for on screen i get this error

 Attempt to perform arithmetic on field 'x' (a nil value)

 

local widget = require "widgets/widget"
local text = require "widgets/text"

local DeathCountUI = Class(widget, function(self, inst, anchor_x, anchor_y) 
	self.inst = inst
	self.x = anchor_x
	self.y = anchor_y
	
widget._ctor(self, "deathcountUI") 
self.title = self:AddChild(text(BODYTEXTFONT, 33, "Death Count: ", UICOLOURS.WHITE))
self.title:SetPosition(self.x - 100, self.y + 20)
self.deaths = self.AddChild(text(BODYTEXTFONT, 33))
self.deathsval = 0

inst:ListenForEvent("killed", function(inst, data)
	self.deathsval = self.deathsval + 1
end)

--    self:StartUpdating() 
end)
return DeathCountUI

I'm Still relatively new to coding and don't understand this error

 

Edited April 25, 2023 by ClownTech
Edited the code

[-LukaS-]

field - a variable that's part of a class

nil - An empty value (doesn't exist)

You're attempting to perform a mathematical operation on 'nothing'. You must be creating a DeathCountUI object without passing in parameters.

DeathCountUI()			-- WRONG
DeathCountUI(inst, 150, 200)		-- CORRECT

 

[ClownTech]

Sorry, im not quite sure where this slots into this, I have the code 

local deathCountUI = Class(widget, function(self, inst, anchor_x, anchor_y) 

which creates the class, I Dont understand where your

deathCountUI(inst, 150, 200)

Comes into this

Edited April 25, 2023 by ClownTech

[-LukaS-]

DeathCountUI is the name of your class that, I'm assuming, you're using to add a widget to PlayerHud. Since the error is that x is nil you must be using DeathCountUI without providing any parameters. DeathCountUI needs 3 parameters inst, anchor_x, anchor_y. 'self' is a hidden parameter so you don't need to pass in any value there. The 150 and 200 that I used are just as an example, you can use any numerical values.

[ClownTech]

im adding deathcountUI to StatusDisplay, is what your trying to say this?

local deathcountUI = Class(widget, function(inst, 150, 200) 

instead of 

local deathcountUI = Class(widget, function(self, inst, anchor_x, anchor_y) 

 

[-LukaS-]

Where is the line that adds DeathCountUI to StatusDisplays, can you send it?

 

local deathcountUI = Class(widget, function(self, inst, anchor_x, anchor_y) 

This line does not add the death counter to StatusDisplay. It only declares the DeathCountUI class.

[ClownTech]

Im just going to send 

ModMain aswell as The code in the widgets folder

 

Modmain;

Spoiler

local deathcountUI = require "/widgets/deathcounterwidget"
AddClassPostConstruct("widgets/statusdisplays", function(self)
    
self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner))
end)

   

 

 

Widget

Spoiler

local widget = require "widgets/widget"
local text = require "widgets/text"

local deathcountUI = Class(widget, function(inst, anchor_x, anchor_y)
	self.inst = inst
	self.x = anchor_x
	self.y = anchor_y
	
widget._ctor(self, "deathcountUI") 
self.title = self:AddChild(text(BODYTEXTFONT, 33, "Death Count: ", UICOLOURS.WHITE))
self.title:SetPosition(self.x - 100, self.y + 20)
self.deaths = self.AddChild(text(BODYTEXTFONT, 33))
self.deathsval = 0

inst:ListenForEvent("killed", function(inst, data)
	self.deathsval = self.deathsval + 1
end)

--    self:StartUpdating() 
end)
return deathcountUI

 

[-LukaS-]

Ah, here's the problem:

local deathcountUI = require "/widgets/deathcounterwidget"
AddClassPostConstruct("widgets/statusdisplays", function(self)
    
self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner))
end)

See, here you're calling 'deathcountUI' with 'self.owner' as the only parameter. You need to add 2 numerical values to that since the class takes 3 parameters. Without them these 2 values:

self.x = anchor_x
self.y = anchor_y

don't exist and so you're getting the 'x is nil' error.

[ClownTech]

So your saying all i need is to add 2 numericals like this?

local deathcountUI = require "/widgets/deathcounterwidget"
AddClassPostConstruct("widgets/statusdisplays", function(self)
    
self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner, 150, 200))
end)

I tried this, I think this is what you mean but then i get the error that line 5 widget code, that self isn't declared, im wondering if this is because i removed self from the code like you told me might've been the original problem?

Edited April 25, 2023 by ClownTech

[-LukaS-]

Oh, you shouldn't have removed 'self' from class declaration:

local deathcountUI = Class(widget, function(self, inst, anchor_x, anchor_y)

When I was talking about omitting 'self' i meant this part:

self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner, 150, 200))

Just as a little tip. But you're fine like this. Just keep these 2 lines how they're here. Keep 'self.owner' and you can change 150 and 200 to a different number if you want.

[ClownTech]

And then arises a new problem, it decides to give me this error which isnt even part of my code.

i dont even know what to do at this point

 

EDIT (Fixed this)

had self.AddChild instead of self:AddChild

Edited April 25, 2023 by ClownTech

[ClownTech]

58 minutes ago, -t- said:

Oh, you shouldn't have removed 'self' from class declaration:

local deathcountUI = Class(widget, function(self, inst, anchor_x, anchor_y)

When I was talking about omitting 'self' i meant this part:

self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner, 150, 200))

Just as a little tip. But you're fine like this. Just keep these 2 lines how they're here. Keep 'self.owner' and you can change 150 and 200 to a different number if you want.

i did do this and after fixing another issue i get the error

:15: attempt to index local 'inst' (a nil value)

i dont understand alot of the nil stuff and don't understand how to fix alot of it

[-LukaS-]

Can you send both of the files again?

[ClownTech]

9 minutes ago, -t- said:

Can you send both of the files again?

i fixed most of this, the game loads the files, except for the fact that it dosent load the numbers and title, so i cant see what its loading

 

Spoiler

local widget = require "widgets/widget"
local text = require "widgets/text"

local deathcountUI = Class(widget, function(self, inst, anchor_x, anchor_y)
	self.inst = inst
	self.x = anchor_x
	self.y = anchor_y
	
widget._ctor(self, "deathcountUI") 
self.title = self:AddChild(text(BODYTEXTFONT, 33, "Death Count: ", UICOLOURS.WHITE)) -- dosent show any of these on screen, so i cant see if its working
self.title:SetPosition(self.x - 100, self.y + 20)
self.deaths = self:AddChild(text(BODYTEXTFONT, 33))
self.deathsval = 0
self.title:Show()

inst:ListenForEvent("killed", function(inst, data)
	self.deathsval = self.deathsval + 1
end)

--    self:StartUpdating() 
end)
return deathcountUI

 

Spoiler

local deathcountUI = require "/widgets/deathcounterwidget"
AddClassPostConstruct("widgets/statusdisplays", function(self)
    
self.owner.deathcounterwidget = self:AddChild(deathcountUI(self.owner, 150, 200))
end)

   

 

 

Edited April 25, 2023 by ClownTech

[-LukaS-]

You might have to adjust the positioning. 150 and 200 might be too much. Try starting with 0, 0 and changing it as fit. If you can't see it no matter the position values there might be a different problem.