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)