Problem with setup in train system

Help and Feedback Scripting Support
#1

Hello! I am trying to make a train system, and for some reason I am getting this error.

 ServerScriptService.Main.TrainSuperClass:19: attempt to call a nil value
SuperTrainClass Script 
local TrainSuperClass = {}
TrainSuperClass._index = TrainSuperClass


local TweenService = game:GetService('TweenService')

function TrainSuperClass.new(TrainModel, Nodes)
	local Train = {}
	
	setmetatable(Train, TrainSuperClass)
	
	Train.Nodes = Nodes
	Train.TestModel = TrainModel
	Train.Node = 1
	
	
	coroutine.wrap(function()
		wait(1)
		Train:Setup()
	end)()
	
	return Train
	
end

function TrainSuperClass:Setup() 
	

	if not self.Nodes:FindFirstChild("Node"..self.Node) then
		warn("Cannot find Node"..self.Node)
		return
	end
	self.Train = self.TestModel:Clone()
	self.Train.Parent = workspace
	
	

	
	 local All = self.Train:GetChildren()
		
		for A = 1,#All do
			if (All[A].Name ~= self.Train.PrimaryPart and All[A]:IsA("BasePart")) then
				local NewWeld = Instance.new("Weld")
				NewWeld.Name = "Weld"
				NewWeld.Part0,NewWeld.Part1 = All[A],self.Train.PrimaryPart
				NewWeld.C0 = All[A].CFrame:inverse()
				NewWeld.C1 = self.Train.PrimaryPart.CFrame:inverse()
				NewWeld.Parent = self.Train.PrimaryPart
			end
		end
	
	
	self.Train:SetPrimaryPartCFrame(self.Nodes:FindFirstChild("Node"..self.Node).CFrame + Vector3.new(0, self.Train.PrimaryPart.Size.Y/2,0))
	self:Move()
end

function TrainSuperClass:GetTime(Distance) 
	return Distance / self.Speed
end


function TrainSuperClass:Move() 


end

function TrainSuperClass:Stop() 
	self.Node = 1
	self:Setup()
end



return TrainSuperClass
TrainClass Script 
local Sp = script.Parent
local Main = Sp.Parent
local TrainSuperclass = require(Main.TrainSuperClass)




local TrainClass = {}
TrainClass._index = TrainClass

setmetatable(TrainClass, TrainSuperclass)

function TrainClass.new(...)
	local self = TrainSuperclass.new(...)
	
	setmetatable(self, TrainClass)
	
	self.Speed = 40
	
	
	
end




return TrainClass
Train1 Script 
wait(1 + math.random())

local Sp = script.Parent
local Main = Sp.Parent
local Classes = Main.Classes
local Train1 = require(Classes.TrainClass)

Train1.new(Main.Train, game.Workspace.Nodes)

I am not asking for the whole code, I am just trying to figure out why I am getting this error, so I can fix it my self.

This is the ServerScriptService
image

Note: I am using Lukas tutorial for this: Here

#2

What is line 19 of TrainSuperClass? Also, can you provide your whole Output window?

#3

image
Here is the output image. And line 19 for the TrainSuperClass is:

	Train:Setup()
#4

That is because the metamethod is __index with two underscores, not one.

1 Like
#5

Ohhhh, wow I really did not notice that I missed the underscore. Now it works, thanks!

1 Like