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

hello,

 

i have 1009 error can't seem find fix for! have movieclip of cat on stage, cat_mc, reset button, reset_btn. document class following , adds 4 different items randomly on stage:

 

 

package  {           import flash.display.*;           import flash.utils.*;           import flash.events.*;             public class ghneimsex6 extends movieclip           {                     public function ghneimsex6()                     {                               //make holder items                               var catitemsholder = new movieclip();                               addchild(catitemsholder);                                 //create items inside holder                               var catitems:array = ["fish","heart","medicine","yarn"];                               makeitems(catitems);                                 var classreference:class;                                 function makeitems(catitems)                               {                                         //iterate through each item in list                                         (var prop in catitems)                                         {                                                   //create random number of items each                                                   var itemsnum:number = 30 + math.round(math.random() * 5);                                                   //create items dynamically attaching them holder movie clip                                                   (var i=0; i<itemsnum; i++)                                                   {                                                             //this needed convert string class reference can                                                             //create objects library.                                                             classreference = getdefinitionbyname(catitems[prop]) class;                                                             var newcatitem = new classreference();                                                             //increment depth next item                                                             catitemsholder.addchildat(newcatitem, 1);                                                   }                                         }                               }                                //reset button reset items on stage                               reset_btn.addeventlistener(mouseevent.click,resetitems);                                function resetitems(myevent:mouseevent)                               {                                         removechild(catitemsholder);                                         catitemsholder = new movieclip();                                         addchild(catitemsholder);                                         makeitems(catitems);                               }                     }           } } 

 

i getting error in custom class, of each of items adding on stage , following:

 

package  {           import flash.events.*;           import flash.display.*;           import flash.geom.rectangle;             public class itembehavior extends movieclip           {                     var arandomnumber:number = randomnumber(1,2);                     //rectangle boundaries                     var xlocation:number = 10;                     var ylocation:number = 10;                     var widthofrect:number = 450;                     var heightofrect:number = 450;                     var rectboundary:rectangle = new rectangle(xlocation,ylocation,widthofrect,heightofrect);                     var itemspeed:number = 7;                     var mindistancebetweenitems:number = 90;                       public function itembehavior():void                     {                               //have each item have random position on stage                               this.x = math.round(math.random() * 470);                               this.y = math.round(math.random() * 470);                                 //have each item have different size                               this.scalex = scalex * arandomnumber;                               this.scaley = scaley * arandomnumber;                                 //add listener move items away cat                               addeventlistener(event.enter_frame,avoidcat);                                 //add listener remove items stage when hit cat                               addeventlistener(event.enter_frame,checkcollision);                     }                       function randomnumber(min:number,max:number):number                     {                               return math.floor(math.random() * ((0.1 + max) - min) + min);                     }                       function avoidcat(event:event):void                     {                               // calculate distance between cat , items                               var distancex:number = this.x - movieclip(parent).cat_mc.x;                               var distancey:number = this.y - movieclip(parent).cat_mc.y;                               var distancexy:number = math.sqrt(((distancex * distancex) + distancey * distancey));                                 // check if distance small enough                               if ((distancexy <= mindistancebetweenitems))                               {                                         // calculate direction between cat , items                                         var currdirection:number = math.atan2(distancey,distancex);                                           // move items opposite direction                                         this.x += itemspeed * math.cos(currdirection);                                         this.y += itemspeed * math.sin(currdirection);                               }                                 //restrict items in rectangle boundaries                               if (this.x < xlocation)                               {                                         this.x = xlocation;                               }                                 if (this.x > widthofrect)                               {                                         this.x = widthofrect;                               }                                 if (this.y < ylocation)                               {                                         this.y = ylocation;                               }                                 if (this.y > heightofrect)                               {                                         this.y = heightofrect;                               }                     }                       //function check collision , remove item                     function checkcollision(event:event):void                     {                               if (movieclip(parent).cat_mc.hittestobject(this))                               {                                         removeeventlistener(event.enter_frame,checkcollision);                                         removeeventlistener(event.enter_frame,avoidcat);                                         parent.removechild(this);                               }                     }           } } 

 

i receiving errors custom class, itembehavior @ lines 44, , 84, following respectively:

 

var distancex:number = this.x - movieclip(parent).cat_mc.x; 

 

if (movieclip(parent).cat_mc.hittestobject(this)) 

 

i made sure go stage before cat_mc it's still giving me null object error.

 

i receiving error addchildat function says following:

rangeerror: error #2006: supplied index out of bounds.

          at flash.display::displayobjectcontainer/addchildat()

          at function/ghneimsex6/$construct/makeitems()

what complete error message(s) 1009 error(s).  before testing go flash publish settings , select option permit debugging.

 

for 2006 error guess trying add index 1 of empty catitemsholder.  have start @ 0.

 

catitemsholder.addchildat(newcatitem, 1);

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