Erro Excessão com thinwire

HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Wrapper cannot find servlet class thinwire.render.web.WebServlet or a class it depends on
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	java.lang.Thread.run(Unknown Source)


root cause 

java.lang.ClassNotFoundException: thinwire.render.web.WebServlet
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
	org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	java.lang.Thread.run(Unknown Source)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.

<?xml version="1.0" encoding="UTF-8"?>
<web-app 
		id="WebApp_ID" version="2.4" 
		xmlns="http://java.sun.com/xml/ns/j2ee" 
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
		xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
		http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>   
        <servlet-name>desktop</servlet-name>   
        <servlet-class>thinwire.render.web.WebServlet</servlet-class>   
        <init-param>   
            <param-name>mainClass</param-name>   
            <param-value>org.teste.Main</param-value>   
        </init-param>   
        <init-param>   
            <param-name>styleSheet</param-name>   
            <param-value>DefaultStyle</param-value>   
        </init-param>   
    </servlet>   
    <servlet-mapping>   
        <servlet-name>desktop</servlet-name>   
        <url-pattern>/*</url-pattern>   
    </servlet-mapping>
 </web-app>

package org.teste;

import thinwire.ui.Application;
import thinwire.ui.Dialog;
import thinwire.ui.Label;

public class Main {

	public static void main(String[] args) {
		
		Application.current().getFrame().setTitle("Olá Mundo No Thinwire!");
		Dialog dialog = new Dialog();
		dialog.setTitle("Janela");
		dialog.setBounds(100, 100, 400, 200);
		Label label = new Label();
		label.setText("Olá Mundo Pelo Thinwire!");
		label.setSize( 150, 50 );
		dialog.getChildren().add(label);
		dialog.setVisible(true);

	}

}