Adding addEventListener too a Child object

programming flash
1

:hr:
Hey guys,

I am programming a “build a tower” game.
After removing the event listener from the first movieclip, flash won’t add the event listener to the by as3 to the stage attached new movieclip.

Error MSG:

TypeError: Error #1010: A term is undefined and has no properties.
at stackers02_fla::MainTimeline/keyDownHandler()



//Vars
var $newObjectName:String;
var $direction:String;
var $level:int;
var $currObjPosX:int;
var $currObjPosY:int;

$newObjectName = "new OBJ";
$direction="goRight";
$level=1;

//Event Listeners
this["mcBlockContainer"+$level].addEventListener(Event.ENTER_FRAME, mcBlockContainerMoveF);
trace(this["mcBlockContainer"+$level]);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);

//Functions
function keyDownHandler(event : KeyboardEvent):void {
    if (event.keyCode==Keyboard.SPACE) {
        $currObjPosX = this["mcBlockContainer"+$level].x;
        $currObjPosY = this["mcBlockContainer"+$level].y;
        this["mcBlockContainer"+$level].removeEventListener(Event.ENTER_FRAME, mcBlockContainerMoveF);
        
        $level++;
        
        $newObject = this["mcBlockContainer"+$level];
        $newObjectName = "mcBlockContainer"+$level;
        
        var $newObject:asBlockContainer = new asBlockContainer;//
        addChild($newObject);
        
        $newObject.y = $currObjPosY - ($newObject.height + 2);
        $newObject.x = $currObjPosX;
        
        
        trace($newObjectName);
        trace($newObject.name);
        $newObject.name = $newObjectName;
        trace($newObject.name);
        
        //PROBLEM!!!    //PROBLEM!!!    //PROBLEM!!!    //PROBLEM!!!    //PROBLEM!!!    //PROBLEM!!!
        this["mcBlockContainer"+$level].addEventListener(Event.ENTER_FRAME, mcBlockContainerMoveF);
        trace("Space pressed");
    }
}

//Enterframe Script
function mcBlockContainerMoveF(e:Event) {
    if (this["mcBlockContainer"+$level].x>=550) {
        $direction="goLeft";

    } else if (this["mcBlockContainer"+$level].x <= 0) {
        $direction="goRight";

    }
    if ($direction=="goRight") {
        this["mcBlockContainer"+$level].x=this["mcBlockContainer"+$level].x+78;
    } else if ($direction == "goLeft") {
        this["mcBlockContainer"+$level].x=this["mcBlockContainer"+$level].x-78;
    }
}//END: mcBlockContainerMoveF

any ideas?

Kind Regards
Marcel