Simple Gui Problem?

function onClicked()
	script.Parent.Parent.Fight.Visible = true
end

script.Parent.MouseButton1Down:connect(onClicked)

So, I want the above script to make a frame visible, it is in a local script, but, It does nothing when I press the button...

EDIT: Should probably add in this detail: The script works fine in studio, buts when playing the game on roblox it self, doesn't work.

script.Parent.MouseButton1Click:connect(function()
print("Clicked")
	script.Parent.Parent:WaitForChild("Fight")
print("Found Fight")
    script.Parent.Parent.Fight.Visible = true
print("Visible")
end)

Ok, so I edited it a bit. I added a WaitForChild just in case it isnt loading or anything.

I also added prints. If you go into the game and press F9, it shows a little output and can tell you any errors. Comment back on what prints/doesnt print.