My script stopped working, why?

I changed a little thing which caused the whole thing to break, here is what is screwing it up.

for index, value in pairs(players) do
    countdown = game.StarterGui.readygo -- starting countdown gui thing
    readygogo = countdown:Clone() -- cloning it
    wait(0.5)
    readygogo.Parent = value:WaitForChild("PlayerGui") -- putting it in playergui but doesnt work
    wait(0.5)
    value:WaitForChild("PlayerGui").readygogo.gogo.ready.Visible = true --makes it visible but doesnt work

There are no error messages when I look in the output, yet it still doesn't work. Help? :v