1136 incorrect number of arguments. expected 0

Question

package  {
          import flash.display.MovieClip;
          import flash.utils.Timer;
          import flash.events.Event;
          import flash.net.URLLoader;
          import flash.net.URLRequest;
          import flash.events.*;
          import flash.events.TimerEvent;
          public class JuteBox extends MovieClip {
                    private var tracks:Array;
                    private var i:int=0;          //points to current track
                    private var pollTimer:Timer = new Timer(100);          //updates UI periodically
                    public function JuteBox(url:String="content/playList.xml") {
                              trace( "JuteBox" );
                              //load the playList
                              var loader = new URLLoader();
                              loader.load( new URLRequest(url));
                              loader.addEventListener( Event.COMPLETE, onListLoaded );
                              //set up the timer
                              pollTimer.addEventListener(TimerEvent.TIMER, updateUI );
                              pollTimer.start();
                              //initizlize the interface
                              //buttons
                              play_btn.addEventListener( MouseEvent.CLICK,
                                        function (e) { tracks[i].play() }
                              //sliders
                              //text box
                              // constructor code
                    }//con
                    private function onListLoaded(e:Event):void {
                              trace( "onListLoaded");
                              var loader = e.target;
                              //populate the array tracks
                              var playList = new XML( loader.data );
                              trace( playList.Song );
                              tracks = [];
                              for each (var song in playList.Song) {
                                        tracks.push( new Track ( song.@src ));
                    }//onbListLoaded
                    //updates the interface perdically
                    private function updateUI(e:Event=null):void {
                    }//updateui
                    //advances to next track
                    private function next(e:Event=null):void {
                    }//next
                    //goes to previous track
                    private function prev(e:Event=null):void {
                    }//prev
          }//class
}//pack
I'm sure it is something obvious but I can't find it. 

Answer 1

For the line you highlighted in red you appear to be creating a new Track object... 
                    tracks.push( new Track ( song.@src ));
which means you should have imported that class if it being used.
Why did you highlight that line?.