[AS3]error 1120, Access of undefined property

programming flash
1

hello,
I m getting this error, i have provided the instance names on its flash file & linkages too, the components are on timeline, but cant access the instances, it seems beyond my mind, to correct it,
flvDisplay(video) is on 1 frame & nex button is on 2 frame

package 
{
    import flash.display.MovieClip;
    import flash.events.*;
    import flash.text.*;
    import fl.video.*;
    import flash.net.*;
    import fl.controls.*;
    
    
    public class Components1 extends MovieClip
    {
         var i:int;
        flvDisplay.addEventListener(VideoEvent.COMPLETE,completeHandler);
        //1120: Access of undefined property flvDisplay.
        //1120: Access of undefined property completeHandler.
        if (nex!=null) //1120: Access of undefined property nex.
        nex.addEventListener(MouseEvent.CLICK, complteHandler);
        //1120: Access of undefined property nex.
        //1120: Access of undefined property complteHandler.
        protected function completeHandler(event:VideoEvent):void
        {
            try 
            { 
                var str:String;
                str="http://localhost/flash/code/test.php?abc=";
                var request:URLRequest = new URLRequest(str); 
                //request.method = URLRequestMethod.POST;
                var loader:URLLoader = new URLLoader(); 
                loader.load(request);
                loader.dataFormat = URLLoaderDataFormat.VARIABLES; 
                loader.addEventListener(Event.COMPLETE, completeHandler1);
                
            }  
            catch (error:Error) 
            { 
                trace("Unable to load URL: " + error); 
            } 
        }
            
         private function completeHandler1(event1:Event):void 
        { 
            var loader:URLLoader = URLLoader(event1.target); 
            trace(i);
            i=event1.target.data.z1;
            gotoAndPlay(i);
        }    
        private function complteHandler(e:Event)
        {
        
            trace("ashish");
        }
            
       

        
    }
}