Error #1010: A term is undefined

1

Hi, i’ve made a simple example here to show you my problem. I have basically created a stage object (“box”), with the nested children, box->b->c. I have exported box for as, with class “box” and base class movieclip. Now i create 4 instances of my box class and add an eventlistener to the nested child c. When i later on try to remove the eventlisterner for myinstance.b.c i get: [COLOR=“Red”]TypeError: Error #1010: A term is undefined and has no properties.
at DocumentClass/removeSomething()[/COLOR]

Here is my code:


package
{
import .... 
	public class DocumentClass extends Sprite
	{
		private var holder:MovieClip = new MovieClip;
		private var one:box; [COLOR="SeaGreen"]//box is a stage obeject[/COLOR]
		[COLOR="SeaGreen"]//its class is set to box, and base class to movieclip[/COLOR]
		
		public function DocumentClass()
		{
			for( var i:int = 0; i<4; i++)
			{	
				one = new box();
				one.x = 160*i;
				one.y = 200
				one.name = "p" + i;
				one.b.c.addEventListener(MouseEvent.MOUSE_OVER, doSomething);
				holder.addChild(one);

			}
                        addChild(holder);
			stage.addEventListener(MouseEvent.CLICK, removeSomething);
			
			
		}
		private  function removeSomething(evt:Event):void
		{
			[COLOR="SeaGreen"]//the error occurs here[/COLOR]
			holder.p1.b.c.removeEventListener(MouseEvent.MOUSE_OVER, doSomething);
		}
		
		private  function doSomething(evt:Event):void
		{
			trace(evt.target.name);
		}
	}
	
	
}

I can’t figure out why i can’t access holder.p1

thanks.