Remove MovieClip

1

how can I remove a movie clip on MOUSE OUT?
What am I doing wrong here that is giving me this error?
Error:
ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.
at flash.display::DisplayObjectContainer/removeChild()
at MethodInfo-14()
out

Code Used:


   item.addEventListener(MouseEvent.MOUSE_OVER, roll4);
     function roll4(e:MouseEvent):void {
     trace("rolled");
 var realShirt1:real = new real();
 addChild(real1);
     }
   item.addEventListener(MouseEvent.MOUSE_OUT, out4);
     function out4(e:MouseEvent):void {
 removeChild(real1);
     }