Class errors: undefined methods and properties

Question

i have a document with objects in the library with the class Hitte, Kern, Ring and Ring_01 [to Ring_16]
tge Ring_ pieces have a subclass of RingSegment.
the code of RingSegment.as is as following:
package {
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.display.MovieClip;
    import flash.display.DisplayObjectContainer;
    import flash.display.Stage;
    public class RingSegment extends MovieClip {
        public var verwijderd=0;
        public function addHitte():void {
            var Hitte_mc:Hitte=new Hitte();
            Hitte_mc.x=Math.random()*550;
            Hitte_mc.y=Math.random()*400;
            stage.addChild(Hitte_mc);
        Hitte_mc.addEventListener(MouseEvent.MOUSE_DOWN,slepenStart);
        Hitte_mc.addEventListener(MouseEvent.MOUSE_UP,slepenStop);
        public function slepenStart(evt:MouseEvent):void {Hitte_mc.startDrag();}
        public function slepenStop(evt:MouseEvent):void {Hitte_mc.stopDrag();}
        public function verdwijnen (evt:Event) {
            if (evt.target.hitTestObject(Hitte_mc)) {
                evt.target.alpha+=-0.1;
                if (evt.target.alpha <= 0.1 && evt.target.alpha > 0) {
                    evt.target.alpha = 0;
                    verwijderd+=1;
which should add a Hitte_mc to the stage, make it draggable , and make the Ring_ objects react to a hittest with the Hitte_mc
but I get tons of errors:
how can i fix these errors?

Answer 1

Oh, I see. I did not notice this before. The class should be:
package {
     import flash.events.Event;
     import flash.events.MouseEvent;
     import flash.display.MovieClip;
     import flash.display.DisplayObjectContainer;
     import flash.display.Stage;
    public class RingSegment extends MovieClip {
          public var verwijderd = 0;
          private var Hitte_mc:Hitte;
          public function addHitte():void {
               if (stage) init();
               else addEventListener(Event.ADDED_TO_STAGE, init);
          private function init(e:Event = null):void
               removeEventListener(Event.ADDED_TO_STAGE, init);
               Hitte_mc = new Hitte();
               Hitte_mc.x = Math.random() * 550;
               Hitte_mc.y = Math.random() * 400;
               stage.addChild(Hitte_mc);
               Hitte_mc.addEventListener(MouseEvent.MOUSE_DOWN,slepenStart);
               Hitte_mc.addEventListener(MouseEvent.MOUSE_UP,slepenStop);
          public function slepenStart(e:MouseEvent):void { Hitte_mc.startDrag(); }
          public function slepenStop(e:MouseEvent):void { Hitte_mc.stopDrag(); }
          public function verdwijnen (e:Event) {
               if (e.target.hitTestObject(Hitte_mc)) {
                    e.target.alpha += -0.1;
               if (e.target.alpha <= 0.1 && e.target.alpha > 0) {
                    e.target.alpha = 0;
                    verwijderd += 1;