Erro Client JME de Web Service

/*
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 * and open the template in the editor.
 */

package hello;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
 * @author ADMIN
 */
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.TextBox;
 
import org.ksoap.SoapObject;
import org.ksoap.transport.HttpTransport;

public class Client extends javax.microedition.midlet.MIDlet {    
  private Display display;        
  private String url = "http://localhost:8080/TResWebService/TesteServicoWebService?WSDL"; 
  TextBox textbox = null; 
    
  public void startApp() { 
    display = Display.getDisplay(this); 
    try {  
      testWebService(); 
    } catch (Exception ex) { 
      System.out.println(ex);    
    } 
  } 

  public void pauseApp() {} 
  public void destroyApp(boolean unconditional) {} 

  public void testWebService() throws Exception { 
    StringBuffer stringBuffer = new StringBuffer(); 
    
    TextBox textBox = null; 
    
    // Chama o WebService
    SoapObject client = new  SoapObject(url,"soma"); 
    client.addProperty("valor1",new Integer(2)); 
    client.addProperty("valor2",new Integer(4)); 
    HttpTransport ht = new HttpTransport(url,"soma");
    stringBuffer.append("Resultado: " + ht.call(client));
   
    // mostra o valor do resultado na tela.
    textBox = new TextBox("Teste WebService", stringBuffer.toString(), 1024, 0); 
    display.setCurrent(textBox); 
  } 
} 

/*public class Client extends MIDlet {
    public void startApp() {
    }

    public void pauseApp() {
    }

    public void destroyApp(boolean unconditional) {
    }
}*/