Backpack GUI system won't work?

So I am working on a backpack/inventory system for my game but this script appears to not be working. It works on studio, but doesn't in the actual game. Here is the script and if you need more information, let me know! Thank you!

local Items = {}
local frames = {}
local Equiped = nil
local Player = game.Players.LocalPlayer
local character = Player.Character

game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Backpack,false)

function Scan(location)
	for i,v in pairs(location:GetChildren()) do
		if v:IsA("Tool") or v:IsA("HopperBin") then
			table.insert(Items,v)
		end
	end
end

Scan(character)
Scan(Player.Backpack)


function Update()
	print(Equiped)
	for i,v in pairs(frames) do
		v:Destroy()
	end
	for i,v in pairs(Items) do
		local sam = script.Sample:Clone()
		sam.Name = v.Name
		sam.Parent = script.Parent.Holder
		sam.ImageLabel.Image = v.TextureId
		sam.Text = v.Name
		table.insert(frames,sam)
		if Equiped ~= nil and Equiped == v then
			sam.BorderSizePixel = 2
		end
		sam.MouseButton1Click:connect(function()
			if Equiped == nil or Equiped ~= v then
				Equiped = v
				character.Humanoid:UnequipTools()
				character.Humanoid:EquipTool(v)
			else
				Equiped = nil
				character.Humanoid:UnequipTools()
			end
		end)
	end
end

function backpackchanged()
	Items = {}
	Scan(character)
	Scan(Player.Backpack)
	Update()
end

backpackchanged()

Player.Backpack.ChildAdded:connect(backpackchanged)
Player.Backpack.ChildRemoved:connect(backpackchanged)

character.ChildAdded:connect(backpackchanged)
character.ChildRemoved:connect(backpackchanged)