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Getting this error:
Document Class Working
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at avatar()
at Document()
and make the answer sort of simple to understand please,


package {

import flash.display.MovieClip;

public class Document extends MovieClip {

var avatarGuy:avatar;

public function Document()
{
trace("Document Class Working"

var avatarGuy:avatar = new avatar();
avatarGuy.x = 20;
avatarGuy.y = 90;
addChild(avatarGuy);

}

}

}

package {

import flash.display.MovieClip;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

public class avatar extends MovieClip {

public function avatar():void
{
stage.addEventListener(KeyboardEvent.KEY_DOWN, myKeyDown);
}

private function myKeyDown(Event:KeyboardEvent):void
{
trace("key press"
}

}

}