Problem with packages

*1016: Base class is final.

*CLASSPATH: C:\Documents and Settings\dani\My Documents\flash\galerija\lib

i set classpath!*

Galery.fla
*

import galery.*;

var myXml:XmlRead = new XmlRead();

*XmlRead.as
*

package galery
{
    import flash.net.*;
    
    public class XmlRead extends XML
    {
        private var Xml:XML;
        private var XmlLoader:URLLoader;
        
        
        public function XmlRead(link:String)
        {
            XmlLoader = new URLLoader();
            XmlLoader.addEventListener(Event.COMPLETE, XmlLoaded);
            XmlLoader.load(new URLRequest(link));
            
            
        }
        
        private function XmlLoaded(event:Event):void
        {
            Xml = new XML(event.target.data);
            
            
        }
    }
}

How can i repair this? :puzzle: