Package Cannot Be Nested 1037 & Syntax Error 1084

Trying to learn how to crerate a Box2D game in WIndows 8 Flash Pro CC.   Opened new document in ActionScript 3.0 Class or ".as" as a Flash Pro application.  Very very new to all developer languages and processes.  Please help.

package {
    import flash.display.Sprite
    import Box2D.Dynamics.*;
    import Box2D.Collision.*;
    import Box2D.Collision.Shapes.*;
    import Box2D.Common.Math.*;
    public class Main extends Sprite{
        public function Main(){
            trace(*my awsome game starts here *);
        }
    }
}