Next/previous image in imageslider

Question

Hi there. I can't seem to get the next/previous buttons working. I get the error "
1061: Call to a possibly undefined method addEventListener through a reference with static type function
What's going wrong?
This is the code:
import fl.containers.UILoader;
//Declaring Variables
var menu:MovieClip = menuMc;
// var prevBtn:MovieClip = menuMc.prevBtnMc;
// var nextBtn:MovieClip = menuMc.nextBtnMc;
var playBtn:MovieClip =  menuMc.playBtnMc;
var stopBtn:MovieClip =  menuMc.stopBtnMc;
var nextBtn:MovieClip =  menuMc.nextBtnMc;
var prevBtn:MovieClip =  menuMc.prevBtnMc;
var imgFolder:String = "imgs/"
var imgArray:Array = new Array("1.jpg","2.jpg","3.jpg","4.jpg","5.jpg","6.jpg","7.jpg","8.jpg");
var imgLoader:UILoader = imgLoader;
var imgCntr:uint = 0;
var imgCntrTotal:uint = imgArray.length;
var imgRequest:URLRequest = new URLRequest(imgFolder + imgArray[imgCntr]);
var imgCntrTxt:TextField = menu.imgCntrTxtTf;
var slideShowTimer:Timer = new Timer (5000,0);
var imgVisible:Boolean = true;
//Init
playBtn.stop();
stopBtn.stop();
nextBtn.stop();
prevBtn.stop();
imgLoader.load(imgRequest);
imgCntrTxt.text = (imgCntr).toString() + "/" + imgArray.length.toString();
//Events
//Play
playBtn.addEventListener(MouseEvent.MOUSE_DOWN,playBtnDown);
playBtn.addEventListener(MouseEvent.MOUSE_OVER,playBtnOver);
playBtn.addEventListener(MouseEvent.MOUSE_OUT,playBtnOut);
//Stop
stopBtn.addEventListener(MouseEvent.MOUSE_DOWN,stopBtnDown);
stopBtn.addEventListener(MouseEvent.MOUSE_OVER,stopBtnOver);
stopBtn.addEventListener(MouseEvent.MOUSE_OUT,stopBtnOut);
//Next
nextBtn.addEventListener(MouseEvent.MOUSE_DOWN,nextBtnDown);
nextBtn.addEventListener(MouseEvent.MOUSE_OVER,nextBtnOver);
nextBtn.addEventListener(MouseEvent.MOUSE_OUT,nextBtnOut);
//Previous
prevBtn.addEventListener(MouseEvent.MOUSE_DOWN,prevBtnDown);
prevBtn.addEventListener(MouseEvent.MOUSE_OVER,prevBtnOver);
prevBtn.addEventListener(MouseEvent.MOUSE_OUT,prevBtnOut);
//Timer
slideShowTimer.addEventListener(TimerEvent.TIMER,timePassed);
//EventHandlers
//Play
function playBtnOver(e:MouseEvent){
          playBtn.gotoAndStop(2);
function playBtnOut(e:MouseEvent){
          playBtn.gotoAndStop(1);
function playBtnDown(e:MouseEvent){
          //Slideshow / Timer starten
          slideShowTimer.start();
//Stop
function stopBtnOver(e:MouseEvent){
          stopBtn.gotoAndStop(2);
function stopBtnOut(e:MouseEvent){
          stopBtn.gotoAndStop(1);
function stopBtnDown(e:MouseEvent){
          // Slideshow / Timer Stoppen
          slideShowTimer.stop();
//Next
function nextBtnOver(e:MouseEvent){
          nextBtn.gotoAndStop(2);
function nextBtnOut(e:MouseEvent){
          nextBtn.gotoAndStop(1);
function nextBtnDown(e:MouseEvent){
          nextImg.play();
//Previous
function prevBtnOver(e:MouseEvent){
          prevBtn.gotoAndStop(2);
function prevBtnOut(e:MouseEvent){
          prevBtn.gotoAndStop(1);
function prevBtnDown(e:MouseEvent){
          prevBtn.play();
//SlideShowTimer
function timePassed(e:TimerEvent){
          imgLoader.addEventListener(Event.ENTER_FRAME,fadeImg);
//Functions
function fadeImg(e:Event){
          if(imgVisible == true){
                    imgLoader.alpha = imgLoader.alpha - 0.05;
                    if(imgLoader.alpha <= 0){
                              imgVisible = false;
                              nextImg();
          if(imgVisible == false){
                    imgLoader.alpha = imgLoader.alpha + 0.05;
                    if(imgLoader.alpha >= 1){
                              imgVisible = true;
                              imgLoader.removeEventListener(Event.ENTER_FRAME,fadeImg);
function nextImg(){
          if(imgCntr < imgCntrTotal){
                    imgCntr++; //staat gelijk aan imgCntr + 1
          }else{
                    imgCntr = 0;
                    imgRequest = new URLRequest(imgFolder + imgArray[imgCntr]);
                    imgLoader.load(imgRequest);
                    imgCntrTxt.text = imgCntr.toString() + "/" + imgCntrTotal.toString();
function prevImg(){
          if(imgCntr == 0)
                    imgCntr = imgArray.length -1;
                    imgCntr--;
                    imgRequest = new URLRequest (imgFolder + imgArray [imgCntr]);
                    imgLoader.load(imgRequest);
                    imgCntrTxt.text = imgCntr.toString() + "/" + imgCntrTotal.toString() ;
function tfF():void{
    imgCntrTxt.text = (imgCntr+1) + "/" + (imgCntrTotal);
Help much appreciated

Answer 1

says this now about
Scene 1, Layer 'As', Frame 1, Line 103
1180: Call to a possibly undefined method prevBtn.
related code:
var prevBtn:MovieClip =  menuMc.prevBtnMc;
//Previous
prevBtn.addEventListener(MouseEvent.MOUSE_DOWN,prevBtnDown);
prevBtn.addEventListener(MouseEvent.MOUSE_OVER,prevBtnOver);
prevBtn.addEventListener(MouseEvent.MOUSE_OUT,prevBtnOut);
//Previous
function prevBtnOver(e:MouseEvent){
          prevBtn.gotoAndStop(2);
function prevBtnOut(e:MouseEvent){
          prevBtn.gotoAndStop(1);
function prevBtnDown(e:MouseEvent){
          prevBtn();
function prevImg(){
          if(imgCntr == 0)
                    imgCntr = imgArray.length -1;
                    imgCntr--;
                    imgRequest = new URLRequest (imgFolder + imgArray [imgCntr]);
                    imgLoader.load(imgRequest);
                    imgCntrTxt.text = imgCntr.toString() + "/" + imgCntrTotal.toString() ;