button not work

[nouff28172440]

i make this button to return to scene 1 but it get error how can i fix??

stop();

Object(this).myExit.addEventListener(MouseEvent.CLICK, nonon);

function nonon (e:MouseEvent):void{

  gotoAndStop(1,"s1");

  }

the error massage is : 

TypeError: Error #1009: Cannot access a property or method of a null object reference.

  at فذائي_fla::MainTimeline/hitsa7an()

[nouff28172440]

this the all code:

stop();

Object(this).myExit.addEventListener(MouseEvent.CLICK, nonon);

function nonon (e:MouseEvent):void{

  gotoAndStop(1,"s1");

  }

//--------------------------------------

juse.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

juse.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

cheesy.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

cheesy.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

batter.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

batter.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

avocado.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

avocado.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

orang.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

orang.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

apple.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

apple.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

melon.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

melon.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

strobary.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

strobary.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

carrot.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

carrot.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

latos.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

latos.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

spinch.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

spinch.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

tomato.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

tomato.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

purpol.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

purpol.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

brad2.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

brad2.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

ricee.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

ricee.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

uu.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

uu.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

myMilk.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

myMilk.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

myfish.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

myfish.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

meat.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

meat.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

myEgges.addEventListener(MouseEvent.MOUSE_DOWN,startdraging) ;

myEgges.addEventListener(MouseEvent.MOUSE_UP,stopdraging) ;

//---------------------------------------------------------- 

function  startdraging(e:MouseEvent):void{

  e.currentTarget.startDrag();

  }

  function stopdraging (e:MouseEvent):void{

  e.currentTarget.stopDrag();

  }

  //-------------------------------------Hit sa7an

addEventListener(Event.ENTER_FRAME,hitsa7an);

function hitsa7an (e:Event):void{

  if(avocado.hitTestObject(sa7an)){

  nonoM.gotoAndStop(2);

  }else {  nonoM.gotoAndStop(1);   }

  }

[JoãoCésar]

Hi.

This error happens probably because you switch scenes but you don't remove the enterFrame listener first. As you added the listener to the main timeline, when you go back to the "s1" scene, the main timeline is still there so the listener. But the objects being accessed inside of the handler function are no longer available.

A suggestion is to write your handler function like this:

function nonon(e:MouseEvent):void
{
    removeEventListener(Event.ENTER_FRAME, hitsa7an);
    gotoAndStop(1, "s1");
}

I hope this helps.

Regards,

JC