ActionScript 2.0 :: Get The #include To Work?

I'm working on some classes in Flash Mx 2004 Pro, but I cannot seem to get the #include to work.

This is the error msg Flash gives me:

**Error** myClass.as: Line 1: Classes may only be defined in external ActionScript 2.0 class scripts.
class myClass {

Total ActionScript Errors: 1 Reported Errors: 1

This is my approach, maybe I'm doing something wrong...

1. I have an external AS file called myClass.as, which resides in the same directory as my Class.FLA

2. I have a constructor function in my class called myClass:

Code:
class myClass{
public function myClass(){
}
}