The shop GUI opens in studio but not in the actual game??

Hi I'm made a shop GUI. All the buttons work like giving you the item and taking away the points but for some reason the GUI will only open in studio not the published game.

Cheers

This is the code to open and close the Shop.

Button = script.Parent
ok = script.Parent.Parent.ok
Open = true

function OnButtonClick()
    if Open == true then
    Button.Text = "Close"
    ok.Visible = true
    Open = false
elseif Open == false then
    Button.Text = "Shop"
    ok.Visible =  false
    Open = true
    end

    end

script.Parent.MouseButton1Down:connect(OnButtonClick)