Removechild

[whocarezzz]

i tried programming something for the first time, without someone explaining anything.
my removechild doesn’t work, saying error 2025.

can anybody help me?
thanks already!

my code:

package
{
//importeer de benodigdheden
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.display.Stage;
import flash.text.TextField;
import flash.text.TextFormat;
import flash.events.TimerEvent;
import flash.utils.Timer;

public class Main extends Sprite 

{
	var ongeval:Sprite;
	
    public function Main():void
	{

	var ongeval:geval = new geval
	addChild(ongeval);
	ongeval.addEventListener(Event.ADDED_TO_STAGE, Init);
	
	var knopje:button = new button
	addChild(knopje);		
	knopje.addEventListener(Event.ADDED_TO_STAGE, Init);

	
	var myFormat:TextFormat = new TextFormat;
	myFormat.size = 27;

	
	var hittext:TextField = new TextField()
     hittext.text = String("boem");
	 hittext.defaultTextFormat = myFormat;
	 hittext.x = 250;
	 hittext.y = 30;
	 hittext .width = 150;
	 hittext.height = 400;
	 hittext.addEventListener(Event.ADDED_TO_STAGE, Init);
	 addChild(hittext);

	
	//1.
	var count:Number = 0;
	//2.
	var myTimer:Timer = new Timer(1, count);	
	//3.
	myTimer.addEventListener(TimerEvent.TIMER, countdown);
	//4.
	myTimer.start();
	//5.
	function countdown(event:TimerEvent):void {
		if((count)+myTimer.currentCount % 10 == 0){
	hittext.text = ("score = " + String(((count)+myTimer.currentCount*1)/10) + "

" + "levens= " + String (levens));
}
}

			//maak een functie aan in de stage
			function Init(e:Event):void
		{

			stage.addEventListener(MouseEvent.CLICK, klik);
			stage.addEventListener(Event.ENTER_FRAME, dood);
			stage.addEventListener(Event.ENTER_FRAME, level);				
			}	
			

			function klik (e:Event):void
			{
			
			count = 0;
			myTimer.reset();
			myTimer.start();
			hittext.text = ("poging2	" + String((count) + myTimer.currentCount));
			ongeval.x = 0;
			onlevag.x = 0;
			levens -= 1; 

** removeChild(ongeval);
**
}

			function level (e:Event):void
			{ 
			if ((count) + myTimer.currentCount  % 100 == 0) 
			{
			hittext.text = "goedzo";
			var ongeval:geval = new geval;
			addChild(ongeval);
			}
			}
			function dood (e:Event):void
			{
			if (levens == -1)
			{
			hittext.text = "you're dead";
			}
			}
			

	}		
}

}