Where to add Event.ADDED_TO_STAGE with error #1009

1

Hello everyone.
I have an error code #1009 and have been googling around and found a lot of links, yet I’m not sure where to put the Event.ADDED_TO_STAGE to make my project work.
The error code is

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at be.boulevart.google.ajaxapi.translation::GoogleTranslation/onResponse()
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at flash.net::URLLoader/onComplete()

and my as3 code is:

package{
    import flash.display.*;
    import flash.events.*;
    import gs.*;
    import fl.motion.easing.*;
    import framework.utils.LoadXML;
    import be.boulevart.google.ajaxapi.translation.*;
    import be.boulevart.google.ajaxapi.*;
    import be.boulevart.google.ajaxapi.search.*    
    import be.boulevart.google.apicore.GoogleApiKeyStore;
    import be.boulevart.google.events.*;

    
    public dynamic class wotd_widget extends MovieClip{
        //vars
        var loadXML:LoadXML = new LoadXML('http://wordsmith.org/awad/rss1.xml',onComplete);
        private var mc01:MovieClip;
        private var mclayout:MovieClip;
        
        
        //constructor
        public function wotd_widget():void{
            trace('wotd');
            
            init_btn();
            
            
        }
        
    
        
        
        
          private function onComplete($xml:XML):void{
            
            trace($xml.channel.item[0].title);
            trace($xml.channel.item[0].description);
            wotd_In.text = $xml.channel.item[0].title;
            des_In.text = $xml.channel.item[0].description;
            var gt:GoogleTranslation = new GoogleTranslation();
            gt.translate($xml.channel.item[0].title,'en','de');
            gt.addEventListener(GoogleApiEvent.TRANSLATION_RESULT,onTranslate);
            
            
        }
        
             private function onTranslate(e:GoogleApiEvent):void{
            trans_In.text = e.data.result;
        }
        

            private function init_btn():void{
            this.mc01 = new trans_btn;
            this.mc01.x = 340.9;
            this.mc01.y = 234.4;
            addChild(this.mc01);
            
            TweenMax.to(this.mc01,1,{x:340.9, y:234.4, ease:Cubic.easeOut,onComplete:onComplete1});
            }
            
            private function onComplete1():void{
            this.mc01.buttonMode = true;
            this.mc01.addEventListener(MouseEvent.ROLL_OVER,mEvent01);
            this.mc01.addEventListener(MouseEvent.ROLL_OUT,mEvent01);
            this.mc01.addEventListener(MouseEvent.CLICK,mEvent01);
        }
        
        function mEvent01(e:MouseEvent):void{
            switch(e.type){
                case 'rollOver':
                //this executes when you rollover the target
                TweenMax.to(MovieClip(e.target),0,{tint:0xFF75B6});
                break;
                
                case 'rollOut':
                //this executes when you rolloff the target
                TweenMax.to(MovieClip(e.target),0,{removeTint:true});
                break;
                
                case 'click':
                //this executes when you click the target
                onClick01();
                break;
            }
        }
            
            private function onClick01():void{
                
                var gt:GoogleTranslation = new GoogleTranslation();
                gt.translate(input_trans.text,'en','de');
                gt.addEventListener(GoogleApiEvent.TRANSLATION_RESULT,onTranslation);
            }
            
         function onTranslation(e:GoogleApiEvent):void{
            
            trace(e.data.to);
            trace(e.data.orig);
            trace(e.data.from);
            trace(e.data.result);
            output_trans.text = e.data.result;
        }
        
        
    }
    
}

NEED YOUR HELP REALLY REALLY FAST! thanks