Class Creation Problem in Publish settings

Question

now iam working in flash 8 version .fla file.......firstly iam save as it to cs4 via Macromedia flash cs4....when i trying to add a new main class for this file
it showing error as
"This feature is not supported by flash 8 , Action script 2.0,to use this feature ,you must flash player 9,Action script 3.0"
but when i publish this to flash player 9,Action script 3.0 it not working properly..........is there any suggestion to avoid this problem???????

Answer 1

if you want to use a document class, you must publish for as3.  if you're using as2 code, you'll need to change all the code to as3.
the simplest solution is to leave it an as2 file and not use a document class.
or, you could create a main as3 swf that has a document class and load your as2 swf into your main as3 swf.