Flash Player Errors and How to Fix Them
Trevor McCauley posted two new tutorials today about Flash Player Errors and how to fix them. One covers runtime errors, or errors that occur while a movie is playing. The other covers compiler errors or errors that occur while developing and testing a movie.
If you’re not using it already, may I suggest using Flex Builder as your ActionScript 3.0 IDE? It provides better debugging that Flash itself does. And you can use it with Flash assets by creating an SWC.
Also see: Debugging Flash applications with Firefox extensions