ActionScript 3.0 :: Getting This Error #1009 Message : Cannot Access A Property Or Method Of A Null Object Reference ?

Aug 3, 2009

how to use actionscript 3.0 and my copy of flash CS4 to create games. I wrote my code exactly like it showed in the tutorial, but for some reason I will occasionally receive an error that says
 
"TypeError: Error #1009: Cannot access a property or method of a null object reference. at Monster/die() at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at fl.motion::AnimatorBase/end() at fl.motion::AnimatorBase/handleLastFrame() at fl.motion::AnimatorBase/nextFrame() at fl.motion::AnimatorBase/handleEnterFrame()"
 
It doesn't happen all the time but it will every once in a while. There doesn't really seem to be anything specifically that triggers it either. I also happened to notice that not all of the enemies respond to being clicked on. I don't know if these two things are related or not. I don't know if the error is caused by the code for the monster library item or the code for the main timeline. This is my code for the monster library item:
 
import fl.motion.Animator;import fl.motion.MotionEvent;var this_xml:XML = <Motion duration="30" xmlns="fl.motion.*" xmlns:geom="flash.geom.*" xmlns:filters="flash.filters.*"> <source>  <Source frameRate="10" x="275" y="200" scaleX="1" scaleY="1" [code]....

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