Inventory GUI working in Studio but broken Online?

Hi, i have this inventory Gui that i found and it works perfectly in studio testing but when i test in online the button doesnt work.....online roblox's default inventory GUI is deleted but the inventory button "InvenButton" doesnt do anything

It is a local script

here is the script

player = game.Players.LocalPlayer

game.StarterGui:SetCoreGuiEnabled('Backpack',false)


--
local Enabled = false


function UpdateInventory()
    if Enabled == false then
        Enabled = true
        script.Parent.Frame.Visible = true
        script.Parent.Frame.CanvasSize = UDim2.new(0,0,0,20*#player.Backpack:children())
        script.Parent.Frame:ClearAllChildren()
        for i,v in pairs(player.Backpack:GetChildren()) do
            Obj1 = Instance.new('ImageButton',script.Parent.Frame)
            Obj1.Size = UDim2.new(0,60,0,60)
            Obj1.Position = UDim2.new(0,5,0,65*i-50)
            Obj1.BackgroundTransparency = 0
            Obj1.Image = v.TextureId
            Obj1.MouseButton1Down:connect(function()
                player.Character.Humanoid:UnequipTools()
                player.Character.Humanoid:EquipTool(v)
            end)
        end
    else
        Enabled = false
        script.Parent.Frame.Visible = false
    end
end

script.Parent.InvenButton.MouseButton1Down:connect(function()
    UpdateInventory()
end)

player.Backpack.Changed:connect(function()
    if Enabled == false then Enabled = true UpdateInventory() end
    if Enabled == true then Enabled = false UpdateInventory() end
end)

could someone point out what is causing it to not work online but work in studio? and maybe provide me with a way to fix it or guide me to fixing it :)