Container.removeChild problem

1

hi i don’t remove ball mc giving error :frowning:

var container:Sprite=new Sprite()
addChild(container)

var ball:MovieClip=new MovieClip();
ball.graphics.beginFill(0xFF8800);
ball.graphics.drawCircle(50,150,30);
container.addChild(ball);
ball.addEventListener(Event.ENTER_FRAME,loop)

function loop(e:Event){
e.target.x+=5
if(e.target.x>250){
e.target.removeEventListener(Event.ENTER_FRAME,loop)
container.removeChild(getChildByName(e.target.name))
}}