How to fix this error

[mido_0]

i want to load external swf but it's give me error

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

    at Main()

the code is

package{

    import flash.display.Sprite;

    import flash.events.MouseEvent;

    import flash.net.navigateToURL;

    import flash.net.URLRequest;

    import flash.display.Loader;

    public class Main extends Sprite{

        private var _loader:Loader = new Loader();

        public function Main():void{

            mc_star.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_gear.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_apple.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_photo.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_buy.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_contact.addEventListener(MouseEvent.CLICK,buttonClick);

            _loader=new Loader();

            addChild(_loader);

        }

        private function buttonClick(e:MouseEvent):void{

            var url:URLRequest=new URLRequest();

            switch(e.target.name){

                case "mc_star": url.url="bg2.swf"; break;

                case "mc_gear": url.url="bg3.swf"; break;

                case "mc_apple": url.url="bg4.swf"; break;

                case "mc_photo": url.url="bg5.swf"; break;

                case "mc_buy": url.url="bg6.swf"; break;

                case "mc_contact": url.url="bg7.swf"; break;

            }

            _loader.load(url);

        }

    }   

}

[kglad]

use:

package{

    import flash.display.Sprite;

    import flash.events.MouseEvent;

    import flash.net.navigateToURL;

    import flash.net.URLRequest;

    import flash.display.Loader;

    public class Main extends Sprite{

        private var _loader:Loader = new Loader();

        public function Main():void{

            mc_star.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_gear.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_apple.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_photo.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_buy.addEventListener(MouseEvent.CLICK,buttonClick);

            mc_contact.addEventListener(MouseEvent.CLICK,buttonClick);

            //_loader=new Loader();

            addChild(_loader);

        }

        private function buttonClick(e:MouseEvent):void{

            var url:URLRequest=new URLRequest();

            switch(e.target.name){

                case "mc_star": url.url="bg2.swf"; break;

                case "mc_gear": url.url="bg3.swf"; break;

                case "mc_apple": url.url="bg4.swf"; break;

                case "mc_photo": url.url="bg5.swf"; break;

                case "mc_buy": url.url="bg6.swf"; break;

                case "mc_contact": url.url="bg7.swf"; break;

            }

            _loader.load(url);

        }

    }   

}

[mido_0]

Thank you for your help

but it's give the same error

you can take look at it

http://mir.cr/0BJTHHF4

[kglad · Accepted solution]

click file/publish settings/swf and tick "permit debugging".  retest.

the line number with the null object will be in the error message.  that will probably be one of your mc_ objects.

when you find which, return to your fla's stage and click the object you think should have that instance name and fix the problem.

[mido_0]

Thank you again for your help

all of this have a instance name

it's give me this error

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

    at Main()

[kglad]

which is line 23?

[mido_0]

  mc_star.addEventListener(MouseEvent.CLICK,buttonClick);

[kglad]

mc_star doesn't exist.

return to your fla's stage and click the object you think is mc_star and fix the problem.

[mido_0]

Thank you i fix the problem

you a great man

[kglad]

you're welcome.

p.s.  please mark helpful/correct responses.