Is this a Luau Error or not?

[griffeyiscool]

This script looks fine too me, heres the script:

repeat task.wait() until game:IsLoaded() task.wait(1)

local function Slider(Seconds)
	local Slide = script.Parent.Parent:WaitForChild("Storage"):WaitForChild("Slide"):Clone()
	Slide:TweenPosition(UDim2.new(-0.119, 0,-0.448, 0),'Out','Sine',0.2)
	task.wait(); wait(Seconds)
	Slide:TweenPosition(UDim2.new(-1.117, 0,-1.454, 0),'In','Sine',0.2)
	task.wait()
	Slide:Destroy()
end

local Buttons = script.Parent.Parent:WaitForChild("Buttons")
local __Replicated = game.ReplicatedStorage:WaitForChild("MenuReplicated")

Buttons.Main.Play.Hitbox.MouseButton1Click:Connect(function()
	Slider(2);
	for _, Dec in pairs(script.Parent.Parent:GetDescendants()) do
		if typeof(Dec) == 'Instance' and Dec:IsA("GuiBase") then
			Dec.Visible = false
			script.Parent.Parent.Enabled = false
			__Replicated.PlayClicked:FireServer()
		end
	end
end)

And heres the error it gives me:

[TheRealANDRO (ANDRO)]

@griffeyiscool

	local Slide = script.Parent.Parent:WaitForChild("Storage"):WaitForChild("Slide"):Clone()

You must parent the object to the workspace before tweening.

[griffeyiscool]

This is UI. It’s not ment to be tweened in workspace.

[TheRealANDRO (ANDRO)]

Then you have to parent the object to the UI.

[griffeyiscool]

It’s under a folder which is in the UI, so it should work though?

[TheRealANDRO (ANDRO)]

You are cloning the object without parenting it to an Instance, it’s parent is nil.
Parent the cloned object to an UI if you want it to be tweenable.

[griffeyiscool]

Alright, i think I understand now, give me a second to try.

[griffeyiscool]

It works, I really appreciate it!