[SOLVED] The gui is not positioning correctly?

My script is to find the resolution of a device then set the x position as of the gui as the XOffset/2 position of the screen, doing the same with the Y axis but without dividing the value. But it does not show at all.

Localscript:

while wait() do
	if game:IsLoaded()==true then
		break
	end
end

while true do
	local screen = workspace.Camera.ViewportSize
	script.Parent.Position = UDim2.new(0, screen.X/2, 0, screen.Y)
end