I was having issues of multiple references to the PlayMakerGui script. If i deleted an extra one then it would tell me i dont have a reference to a script.
What i did i think was add one manually which in the docs or tutorials says you can do..... But when i would do that it would do its automatic thing at the same time and i end up with two... So i ended up deleting them all and then when i either opened the file again or clicked on a GUI object it would realize it needed one and would put one in.... Then all was good.. I deleted my old GUI ones as they seemed to be referencing a script that i had deleted or something.