Error in code as3?

I have a folder contains swf and xml files.

This is my AS3 code :

import fl.transitions.Tween;
import fl.transitions.easing.*;
import fl.transitions.TweenEvent;
import flash.net.URLRequest;
import flash.display.Loader;
import flash.events.Event;
import flash.events.ProgressEvent;

function loadMyswf(url:String):void {
    var myswf:Loader = new Loader();
    var url2:URLRequest = new URLRequest("");
    myswf.load(url2);
    addChild(myswf);  
}

I try to load an swf file using a Loader ( myswf ) when the user click on the AccordionTreeMenu V3 component, but that is not working.

So, what is wrong with my code ?