Why is this script not working?

I have 2 identical scripts, both in the same type of GUI (I copied one, and put it into startergui) and one works fine, the other doesn't work, then causes the first GUI to not work. Here is the script in both (Output says nothing)

local productId = 160676880
script.Parent.MouseButton1Click:connect(function()
    player=script.Parent.Parent.Parent.Parent.Parent
    Game:GetService("MarketplaceService"):PromptProductPurchase(player, productId) -- should pop up a dialog that prompts the player
end)