local script doesn't change a textlabel text but doesnt show any errors?

local Players = game:GetService("Players")
function starter()
	wait(1)
	script.Parent.Text = "jaja"
end

game.Players.PlayerAdded:connect(starter)

both in-game, in studio and in local server

FULL CODE

--FULL CODE INSIDE GUI, PUT IT IN A SERVER SIDE SCRIPT BUT PLAYER ADDED FOR CURRENTEXP CALCULATE AND GIVELEVEL STILL DOESNT WORK--
local owner = game.Players.LocalPlayer
local ownerStats = owner.Stats
local currentExp = 100
local var = 1
local expNeeded

function onLevel()
	ownerStats.Value = ownerStats.Value+3
	ownerStats.Defense.Value = ownerStats.Defense.Value+1
	ownerStats.Strength.Value = ownerStats.Strength.Value+1
	ownerStats.Vitality.Value = ownerStats.Vitality.Value+1
	ownerStats.Agility.Value = ownerStats.Agility.Value+1
	ownerStats.Dexterity.Value = ownerStats.Dexterity.Value+1
	ownerStats.Intelligence.Value = ownerStats.Intelligence.Value+1
end

function currentexpCalculate()
	while var <= ownerStats.Lvl.Value do
		currentExp = currentExp*(1+(.20))
		var = var+1
	end
	expNeeded = currentExp
	if ownerStats.Exp.Value <= expNeeded then
		owner.PlayerGui.mainUI.Frame.expHolder.expBar:TweenSize(UDim2.new(ownerStats.Exp.Value/expNeeded, 0, 1, 0), Enum.EasingDirection.Out, Enum.EasingStyle. Linear, 0.1)
	end
end

function expChanged()
	currentexpCalculate()
	if ownerStats.Exp.Value >= expNeeded then
		while ownerStats.Exp.Value >= expNeeded do
			ownerStats.Exp.Value = ownerStats.Exp.Value-expNeeded
			ownerStats.Lvl.Value = ownerStats.Lvl.Value+1
			onLevel()
		end
	end
end

function runThis()
	owner.PlayerGui.mainUI.Frame.expHolder.expBar:TweenSize(UDim2.new(ownerStats.Exp.Value/expNeeded, 0, 1, 0), Enum.EasingDirection.Out, Enum.EasingStyle. Linear, 0.1)
	owner.PlayerGui.mainUI.Frame.pictureHolder.levelHolder.Text = ownerStats.Lvl.Value
end

function giveLevel()
	print("lmao")
	script.Parent.Parent.mainUI.Frame.pictureHolder.levelHolder.Text = owner.Character.Name
end

game.Players.PlayerAdded:Connect(giveLevel)
game.Players.PlayerAdded:Connect(currentexpCalculate)
ownerStats.Exp.Changed:Connect(expChanged)
ownerStats.Lvl.Changed:Connect(runThis)

IT DOESNT EVEN PRINT "LMAO" :(