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

thanks but it did not work.

this is what i get:

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

at hit_the_ball_onepage_fla::MainTimeline/frame2()[hit_the_ball_onepage_fla.MainTimeline::frame2:77]

at flash.display::Sprite/constructChildren()

at flash.display::Sprite()

at flash.display::MovieClip()

at flash.display::MovieClip/nextScene()

at hit_the_ball_onepage_fla::MainTimeline/fl_ClickToGoToNextScene_2()[hit_the_ball_onepage_fla.MainTimeline::frame1:10]

i can not identify the problematic line.

this is the full script:

stop()
var maxMove:Number =50;
var bounds:Rectangle = new Rectangle(this.volumeSlider.x, this.volumeSlider.y, -maxMove, 0);
var scrolling:Boolean = false;

function startScroll (e:Event):void {
scrolling = true;
this.volumeSlider.startDrag (false,bounds);
}

function stopScroll (e:Event):void {
  scrolling = false;
  this.volumeSlider.stopDrag ();
}

function enterHandler (e:Event):void {
  if (scrolling == true) {
MovieClip(this.root).setVolume(1-((bounds.x-this.volumeSlider.x)/maxMove));
}
}

function setVolume(vol:Number){
var mod:SoundTransform = new SoundTransform();
mod.volume = vol;
my_channel.soundTransform = mod;
}
   
addEventListener (Event.ENTER_FRAME, enterHandler);
this.volumeSlider.addEventListener (MouseEvent.MOUSE_DOWN, startScroll);
stage.addEventListener (MouseEvent.MOUSE_UP, stopScroll);

import flash.events.Event;
import flash.display.MovieClip;
import flash.filters.*;
var my_sound:SoundId = new SoundId();
var my_channel:SoundChannel = new SoundChannel();
var my_hit:HitId = new HitId();
var my_channel_hit:SoundChannel = new SoundChannel();      
var my_miss:miss = new miss();
var my_miss_hit:SoundChannel = new SoundChannel();
var slidex=1
var radiusw:Number = which_balloon.width
var random_color=Math.random()*0xFFFFFF
var hits:Number = 0;
var check_hits:Number = 1;
var balls_speed:Number=1
var checks=false
var speed=0;
var gova = 0;
var balloon_position=0
var mehirut:Number = speed
var balloon_bevel:BevelFilter = new BevelFilter();

play_btn.addEventListener(MouseEvent.CLICK, playSound)
stop_btn.addEventListener(MouseEvent.CLICK, stopSound);
my_channel = my_sound.play();
bow.center.x=0
which_balloon.under_balloon.color=0xffffff
balloon_bevel.angle=45
balloon_bevel.blurX=5
balloon_bevel.blurY=5
balloon_bevel.distance=5
balloon_bevel.quality=3
balloon_bevel.strength=2
balloon_bevel.highlightColor=0xffffff
balloon_bevel.shadowColor=0x000000
BitmapFilterType.INNER

amount.text = String(hits);
check_hit.text = String(check_hits);
ball_speed.text = String(balls_speed);
which_balloon.addEventListener ( Event.ENTER_FRAME,kav);
mehirut_hez.addEventListener ( Event.ENTER_FRAME, hez_mehirut );
bow.meitar_d.addEventListener(Event.ENTER_FRAME, rotateMoveClip_d);
bow.meitar_u.addEventListener(Event.ENTER_FRAME, rotateMoveClip_u);
bow.center.addEventListener(MouseEvent.MOUSE_DOWN, drag);
slide.addEventListener(MouseEvent.MOUSE_DOWN, drag_slide);
slide.addEventListener(MouseEvent.MOUSE_UP, text_slide);
slide.addEventListener(MouseEvent.MOUSE_OUT, drop_slide);      
which_balloon.addEventListener(Event.ENTER_FRAME, bevel);
ashpat_hizim.addEventListener(MouseEvent.CLICK,show_hez)
bow.center.addEventListener(MouseEvent.MOUSE_UP, drop);
hit_arrow.addEventListener(Event.ENTER_FRAME, kadima);
hit_arrow.bullets.addEventListener(Event.ENTER_FRAME,kadima);
hit_arrow.alpha=0;

function drag_slide(MouseEvent){
slide.startDrag(false, new Rectangle(695,555,160,0));

}

function drop_slide(MouseEvent){
slide.stopDrag()

if(slide.x<=735){
  slidex=1
  balls_speed=slidex
  ball_speed.text=String(1)
}
if(slide.x>=736&&slide.x<=775){
  slidex=5
  ball_speed.text=String(5)
}
if(slide.x>=776&&slide.x<=815){
  slidex=10
  ball_speed.text=String(10)
}
if(slide.x>=816&&slide.x<=855){
  slidex=15
  ball_speed.text=String(15)
}


}
//force delay to balloons before starting to move
function kav(e:Event){
var myTimer:Timer = new Timer(2200,1);
myTimer.addEventListener(TimerEvent.TIMER, delay);
function delay (e:TimerEvent):void{
  if(which_balloon.y>=450){
   which_balloon.y-=25
  }
  if(which_balloon.y<449){
   which_balloon.y-=slidex
   //slidex/20
  }

}
if(checks==true){
myTimer.start();
}
if((hit_arrow.x<=0)||(arrows.y>=550)){
checks=false
 
  }

if(which_balloon.y<=10){
checks=false
 
  }
  if(which_balloon.y<=-200){
     which_balloon.y=540
  }
}

//defines the speed for the text box(showa the speed of the arrow)
function hez_mehirut(e:Event){
mehirut=Math.floor(bow.center.x/1.5)*10
mehirut_hez.text=String(mehirut)
}

// what happens when  starting todrag the bpw.center
function drag(MouseEvent){
which_balloon.y=540
spring.gotoAndPlay(2)
random_color=Math.random()*0xFFFFFF
var balloon_color:ColorTransform = which_balloon.under_balloon.transform.colorTransform;
balloon_color.color = random_color;
which_balloon.under_balloon.transform.colorTransform = balloon_color;
radiusw=which_balloon.width*Math.random()*2
if(radiusw<=32||radiusw>=120){
radiusw=80
}
which_balloon.width=radiusw
which_balloon.height=radiusw
balloon_position=1
bow.center.startDrag(false, new Rectangle(0,-50,75,100));
hit_arrow.alpha=0;
hit_arrow.rotation=0
hit_arrow.bullets.rotation=0
checks=true
balloon_position=1
bow.center.startDrag(false, new Rectangle(0,-50,75,100));
hit_arrow.alpha=0;
hit_arrow.rotation=0
hit_arrow.bullets.rotation=0
checks=true
}

//what happens when mouse up after "drag"
function drop(e:MouseEvent):void{

if(bow.center.x>=0&&bow.center.x<=25){
  stopDrag();
  bow.center.x=0;
  demi.alpha=1
  arrows.alpha=0
  demi.gotoAndPlay(2); 
     balloon_position=0
     which_balloon.y=540
  my_miss_hit = my_miss.play();
 
  
}
else{
     speed=bow.center.x/1.5
     stopDrag();
  bow.center.x=0;
  bow.center.y=0;
  arrows.alpha=0
  retet.gotoAndPlay(2);
  gova=arrows.rotation
  hit_arrow.alpha=1
  demi.alpha=0
 
  } 
}

//this controls the hit_arrow speed and orientation
function kadima(e:Event){

var pointx=(which_balloon.x)
var pointy=(which_balloon.y)
var zavit=hit_arrow.rotation
if(hit_arrow.alpha==1&&balloon_position==1){
  yellow.x=which_balloon.x
  yellow.y=which_balloon.y
  hit_arrow.x-=speed;
  hit_arrow.rotation=gova;
  hit_arrow.y-=zavit
}
if(hit_arrow.x<=-1575){
  hit_arrow.alpha=0
 
 
}
       if(hit_arrow.bullets.hitTestObject(which_balloon)){
       my_channel_hit = my_hit.play();
    hit_arrow.y-=25
    hits=hits+1
    amount.text=String(hits);
    checks=false
   
    balloon_position=0
    yellow.gotoAndPlay(2)
    }
    if(hit_arrow.x<=-1500){
    hit_arrow.y-=25
    balloon_position=0
    which_balloon.y=540
    }
    if(balloon_position==0){
   which_balloon.y=755
   hit_arrow.alpha=0  
    }
    if((hit_arrow.x<=0)&&(hit_arrow.x>=-100)){
   my_miss_hit = my_miss.play();
    }
   
}

// what happens when clicking on ashpat hezim
function show_hez(MouseEvent){
spring.gotoAndStop(1)
check_hits=check_hits+1
check_hit.text=String(check_hits);
arrows.alpha=1;
hit_arrow.alpha=0;
hit_arrow.y=275
hit_arrow.x=750
hit_arrow.rotation=0
demi.alpha=0
checks=false
function bevels(e:Event){

}

}

//this function controls the  upper meitar and the arrow
function rotateMoveClip_u(e:Event){
var target=(bow.center.x);
var target_arrow=bow.center.y
    e.target.rotation=((-target)/3.15);
bow.meitar_u.height = Math.sqrt((target-50)*(target-50) + 150*150);
bow.meitar_u.width=(target/20+2);
yad.width =227-target;
yad.height=82
arrows.x=762+target;
arrows.rotation=target_arrow;
}

//this function controlls the down meitar
function rotateMoveClip_d(e:Event){
var target_d=(bow.center.x-7);
    bow.meitar_d.rotation=((target_d)/3.15);
bow.meitar_d.height = Math.sqrt((target_d-60)*(target_d-60) + 150*150);
bow.meitar_d.width=(target_d/20+2);
}
function bevel(e:Event){
which_balloon.filters = [balloon_bevel]
}

function text_slide(MouseEvent){
ball_speed.text=String(slidex)
}

function playSound(event:MouseEvent):void{
my_channel = my_sound.play();
}
function stopSound(event:MouseEvent):void{
my_channel.stop();
}