Error #2007 parameter listener must be non-null

programming flash
1

Hi all,

I have a question about AS3. I’m new to coding/scripting/AS3/Flash, so I’m sure that I am making some rookie mistakes. I really need some guidance. Thanks, I really appreciate the help!

Ok,

I keep getting the following error (I only get the error when I use the if() conditional. If I remove it the code runs fine. But I need the functions to run only under certain conditions) :

TypeError: Error #2007: Parameter listener must be non-null.
at flash.events::EventDispatcher/addEventListener()
at Buttons_mc1test()
at level_rizon_fla::Page1_1/frame1()

This is my code:


package {
    import flash.display.MovieClip;
    import fl.transitions.Tween;
    import fl.transitions.TweenEvent;
    import fl.transitions.easing.*;
    import flash.events.MouseEvent;
    import fl.containers.UILoader;
    import flash.events.Event;
    import flash.net.URLRequest;


    public class Buttons_mc1test extends MovieClip {

        public function Buttons_mc1test(buttonUp:MovieClip, buttonDown:MovieClip, photo_btns:MovieClip, band_bg:MovieClip, pageLoad:UILoader, pageLocation:String) {

            /////////////----------------Variables---------------------------------///////////////
            var headBtnDown:Tween=new Tween(buttonUp,"alpha",None.easeOut,1,1,5,false);
            var buttonsOutx:Tween=new Tween(photo_btns,"scaleX",None.easeNone,1,1,20,false);
            var buttonsOuty:Tween=new Tween(photo_btns,"scaleY",None.easeNone,1,1,20,false);
            var buttonsOuta:Tween=new Tween(photo_btns,"alpha",None.easeNone,1,1,20,false);
            var pageBackGround:Tween=new Tween(band_bg,"height",None.easeNone,188,188,30,false);
            var pageBackGroundy:Tween=new Tween(band_bg,"y",None.easeNone,528,528,30,false);

            var loadPageTween:Tween=new Tween(pageLoad,"alpha",None.easeOut,0,0,20,false);

            var headBtnOver:Tween=new Tween(buttonDown,"alpha",None.easeOut,0,0,15,false);
            var isPageLoaded:Boolean=false;

            /////////////----------------Global Event Listenters--------------------------///////////////
            buttonUp.addEventListener(MouseEvent.MOUSE_OVER, headerOver);
            buttonUp.addEventListener(MouseEvent.MOUSE_OUT, headerOut);
            pageLoad.addEventListener(Event.COMPLETE, exitPages);

            /////////////----------------Functions---------------------------------///////////////

            function exitPages(event:Event):void {
                isPageLoaded=true;
            }


            ////////////-------------if no page is not loaded--------------------///////////////////
            if (isPageLoaded==false) {
                function headerOut(e:MouseEvent):void {
                    headBtnOver.stop();
                    headBtnOver.continueTo(0,10);
                }

                function headerOver(e:MouseEvent):void {
                    headBtnOver.stop();
                    headBtnOver.continueTo(1, 15);
                    buttonUp.addEventListener(MouseEvent.CLICK, headerDown);
                }

                function headerDown(e:MouseEvent):void {

                    buttonUp.removeEventListener(MouseEvent.MOUSE_OUT, headerOut);
                    buttonUp.removeEventListener(MouseEvent.MOUSE_OVER, headerOver);

                    headBtnDown.stop();
                    buttonsOutx.stop();
                    buttonsOuty.stop();
                    buttonsOuta.stop();
                    pageBackGround.stop();
                    pageBackGroundy.stop();

                    headBtnDown.continueTo(0,5);
                    buttonsOutx.continueTo(3,20);
                    buttonsOuty.continueTo(3,20);
                    buttonsOuta.continueTo(0,20);
                    pageBackGround.continueTo(300,30);
                    pageBackGroundy.continueTo(102,30);

                    loadPageTween.stop();
                    loadPageTween.continueTo(1,30);
                    pageLoad.load(new URLRequest(pageLocation));
                    buttonUp.removeEventListener(MouseEvent.CLICK, headerDown);

                    buttonUp.addEventListener(MouseEvent.CLICK, pageExit);
                }

                function pageExit(e:MouseEvent) {
                    loadPageTween.stop();
                    loadPageTween.continueTo(0,30);
                    loadPageTween.addEventListener(TweenEvent.MOTION_FINISH, unloadPage);
                    buttonUp.addEventListener(MouseEvent.CLICK, headerDown);
                    buttonUp.addEventListener(MouseEvent.MOUSE_OUT, headerOut);
                    buttonUp.addEventListener(MouseEvent.MOUSE_OVER, headerOver);

                    headBtnDown.stop();
                    headBtnDown.continueTo(1,5);
                    buttonsOutx.stop();
                    buttonsOuty.stop();
                    buttonsOuta.stop();
                    pageBackGround.stop();
                    pageBackGroundy.stop();


                    buttonsOutx.continueTo(1,20);
                    buttonsOuty.continueTo(1,20);
                    buttonsOuta.continueTo(1,20);
                    pageBackGround.continueTo(188,30);
                    pageBackGroundy.continueTo(528,30);

                    buttonUp.removeEventListener(MouseEvent.CLICK, pageExit);

                }

                function unloadPage(e:TweenEvent) {
                    pageLoad.unload();
                    loadPageTween.removeEventListener(TweenEvent.MOTION_FINISH,unloadPage);

                }
            } else {
                
                
            }
        }
    }
}