Why does this work in solo but not multiplayer?

wait(20) --I thought the script loaded before the server so I added a wait time of 25
print("5")
wait(5)
part=game.Workspace.PartOne --The part that changes the Gui when it is touched 
print("PartOne found")
player=game.Players.LocalPlayer
print("Player found")
print(player)

function touched()
    player.PlayerGui.ScreenGuiOne.Frame.Visible=false
    wait()
    player.PlayerGui.ScreenGuiTwo.Frame.Visible=true
    print("Text two.")
end
part.Touched:connect(touched)

It works in solo mode but whenever I play in multiplayer (1 person server) the Gui does not change. I've tried waiting 25 seconds before it searches for the player but it still doesn't work.