ArgumentError: Error #2012: Class cannot be instantiated.

[BoJaN111]

My SWF compiles fine but I'm getting the 2012 error when I try to instantiate my class and I have no idea how to fix it, help please

Edit: I just commented out every line of code so it's just a basic class that does absolutly nothing and it still throws this error at me

Edit Again.. Resolved, Had to add my classpath to publish settings as well as in preferences - whats up with that? bug? I use a custom classpath on my secondary HDD(never ever gets formatted)