Need help removing children from a container in a MovieClip

1

i’m getting the #1010 error… code below:

 
var curProject:int = 0;
var curExample:int = 0;
var container:MovieClip = new MovieClip();
im.addChild(container);
 
function showExamples(e:Event):void {
 var exampleList:XMLList = xmlData.project[curProject].example;
 while(im.container.numChildren > 0){
    im.container.removeChildAt(0);
 }
 for(var i:int = 0; i < exampleList.length(); i++){
  var newExample:exampleIcon = new exampleIcon();
  newExample.x = 485;
  newExample.y = (i*25)+20;
  if(i == curExample){
   newExample.transform.colorTransform = c;
  }
  else{
   newExample.addEventListener(MouseEvent.CLICK, exampleClick);
   newExample.addEventListener(MouseEvent.MOUSE_OVER, exampleOver);
   newExample.addEventListener(MouseEvent.MOUSE_OUT, exampleOut);
   newExample.buttonMode = true;
  }
  newExample.alpha = (i == curExample) ? .6 : .3;
  newExample.name = String(i);
  newExample.mouseChildren = false;
  im.container.addChild(newExample);
 }
}

I appreciate any help.