Take one sample.fla which doesn’t contain any runtime error as well complier eror and run the application.
1. Debug movie.
2. After Flash Player is launched to show your swf, right click in the Player
and select Debugger.
3. Select Local Host and click Connect.
4. At this point, a debugger connection should be established.
at this time connection did not establish, and a message. Enjoy with debugger.