error #2007

hi , how all? hope fine...

 

iam trying make game when object hit object delete  object these errors

 

typeerror: error #2007: parameter hittestobject must non-null.

@ flash.display::displayobject/_hittest()

@ flash.display::displayobject/hittestobject()

@ main/onenterframe()

 

and here class

(iam sure problem class because closed classes except 1 )

 

 

 

package  {

import flash.display.movieclip;
import flash.events.event;


public class main extends movieclip {
 
 
 
  public function main() {
addeventlistener(event.added_to_stage,onaddedtostage)  
}


public function onaddedtostage(event:event):void
  {
addeventlistener(event.enter_frame,onenterframe )
 
 
}

  public function onenterframe (event:event)
  {
  
    if (hero.hittestobject(bat1) && (bat1) && (bat1.stage))
    {
     healthbar1.width -=1
     trace("hhh")
    }
    if (healthbar1.width >=  80 && healthbar1.width <=  100 ){
     zelda1.gotoandplay(1)
    }
    if (healthbar1.width >=  60 && healthbar1.width <=  80){
     zelda1.gotoandplay(2)
    }
    if (healthbar1.width >=  40 && healthbar1.width <=  60){
     zelda1.gotoandplay(3)
    }
    if (healthbar1.width >=  20 && healthbar1.width <=  40){
     zelda1.gotoandplay(4)
    }
    if (healthbar1.width >=  0 && healthbar1.width <=  20){
     zelda1.gotoandplay(5)
    }
    if (hero.hittestobject(portal2)){
     var map2:map2 = new map2
     addchild(map2)
     if(map1.stage){
     removechild(map1)
     }
     }
     if (hero.hittestobject(portal3) && (portal3) && (portal3.stage) && (bat1)){

      var map4:background = new background();

      if(bat1){

     removechild(bat1)

     bat1.removeeventlistener(event.enter_frame, onenterframe);  // doesn't need done unless added listener outside bat1 classs

     bat1 = null;

   removechild(portal3)
   portal3 = null
  
   }
     }
    
  }


}


}

 

 

i talked problem before in discuss

http://forums.adobe.com/message/4620620#4620620

 

and project image here

http://forums.adobe.com/message/4615780#4615780

 

i tried alot check if statement bat1 object error still.

 

thank you

you're not following directions.  use code suggested.

 

using

 

if(hero.hittestobject(bat1)&&bat1)

 

is not same as

 

if(bat1){

if(hero.hittestobject(bat1))

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