Hello, I'm looking for some expert help. I've made the corrections to the code starting on p 381 listed in the errata. I still have two errors that boggle the hell out of me. For the following code:

            if( stage != null ) {
                stage.scaleMode = StageScaleMode.NO_SCALE;
                stage.align = StageAlign.TOP_LEFT;
            }

I am receiving the following errors:
1120 Access of an undefined property StageAlign
1120 Access of an undefined property StageScaleMode