title: Error #1009: Cannot access a property or method of a null object reference 5
body: <p>Help I dont know whats wrong ._. i checked instance and names still not right.
  I hope anyone can help me with the fix</p>
  
  <p>i added void and removed still no changes. i renamed all the frames and put the same name but still nothing</p>
  
  <pre><code>TypeError: Error #1009: Cannot access a property or method of a null object reference.
      at fef_fla::MainTimeline/frame1()
  </code></pre>
  
  <p>My code i checked everything</p>
  
  <pre><code>stop();
  
  header_mc.home_btn.addEventListener(MouseEvent.CLICK, gohome);
  header_mc.logo_btn.addEventListener(MouseEvent.CLICK, gohome);
  
  function gohome (event:MouseEvent):void{
      gotoAndStop(1)
  }
  
  header_mc.about_btn.addEventListener(MouseEvent.CLICK, goabout);
  
  function goabout (event:MouseEvent):void{
      gotoAndStop(2)
  }
  
  header_mc.image_btn.addEventListener(MouseEvent.CLICK, goimage);
  
  function goimage (event:MouseEvent):void{
      gotoAndStop(3)
  }
  
  ////////Button 1//////////
  thumb1_btn.addEventListener(MouseEvent.CLICK, GetFirstImage)
  function GetFirstImage (event:MouseEvent):void{
      gotoAndStop(4)
  }
  ////////Button 2//////////
  thumb2_btn.addEventListener(MouseEvent.CLICK, GetSecondImage)
  function GetSecondImage (event:MouseEvent):void{
      gotoAndStop(5)
  }
  ////////Button 3//////////
  thumb3_btn.addEventListener(MouseEvent.CLICK, GetThirdImage)
  function GetThirdImage (event:MouseEvent):void{
      gotoAndStop(7)
  }
  ////////Button 4//////////
  thumb4_btn.addEventListener(MouseEvent.CLICK, GetForthImage)
  function GetForthImage (event:MouseEvent):void{
      gotoAndStop(6)
  }
  
  header_mc.contact_btn.addEventListener(MouseEvent.CLICK, gocontact);
  
  function gocontact (event:MouseEvent):void{
      gotoAndStop(7)
  }
  
  header_mc.demo_btn.addEventListener(MouseEvent.CLICK, godemo);
  
  function godemo (event:MouseEvent):void{
      gotoAndStop(8)
  }
  </code></pre>