ActionScript 3.0 :: Sprite Trying To Remove Itself From Stage (Throwing Errors)

Aug 5, 2009

I'm trying to have a bullet Sprite remove itself from the stage once it is off the stage, but Flash keeps throwing #1009 errors at me. I've looked over the code several times and don't understand what's wrong.

Bullet code:
package {
import flash.display.Sprite;
import flash.display.MovieClip;
import flash.events.*;
public class Bullet extends Sprite {
private var bullet_direction;
[Code] .....

Error message:
Code:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at Bullet/DestroyBullet()
at Bullet/BulletMovement()

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