Hello,
i was trying to move my GUI in to the PlayerGui but its not working.
Well, where is your GUI currently at? are you trying to clone the GUI to your player? if you actually just want to move it, try putting it in StarterGui, that way when the player spawns it will be in his PlayerGui.
Just do
local gui = Screengui:Clone() gui.Parent = game.Players.playername.PlayerGui