actionscript3 calling functions in Main from a another class

Even I am programmer I am very, very, new to as3. Problem: I have define a classA in aA.sp file.

package{

     import flash.display.Sprite
     .......
     public class aA extends Sprite{
        function aA{ ....   }      //constructor

        functio playVideo(url){.....}
   }

I have defined Main in the document class in the cs4 .flv file The Main class is defined in the Main.as file. package{ import flash.display.Sprite; ....

  public class Main extends Sprite{
    public function Main(){
         var v:Sprite = new aA();
        v.playVideo("clip.flv");
        addChild(v);
    }
}

}

When test on cs4 (contol>enter) I get following error

1061: Call to a possibly undefined method playVideo through a reference with static type flash开发者_运维技巧.display:Sprite

Please help me. I am stuck! ( may be its a simple error ) Thanks in advance.

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Make sure that your Main class is in the same package as the aA class (or otherwise use import to import that package). Set the type for your v to aA ( var v:aA = new aA(); ) .

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Make playVideo public or make sure aA is in the same package as Main.