Flash ReferenceError: Error #1065: Variable Application is not defined.

If you are receiving this error when publishing your flash as3 swf it is because you need to declare your class as public. Private classes can not be used as document classes because they are out of the class package and therefore are not a part of the private scope.

I’ve seen a bunch of people with this problem so I hope this helps. (courtesy of http://optimastudios.com)