Hello guys does any one try this?

i follow the tutorials here A Free Java Application for sending SMS using Java and GSM Modem connected to your PC COM port

but i get an error don't know what is the problem.

im trying this code 
public class SMSClient implements Runnable{
 
  public final static int SYNCHRONOUS=0;
  public final static int ASYNCHRONOUS=1;
  private Thread myThread=null;
 
  private int mode=-1;
  private String recipient=null;
  private String message=null;
 
  public int status=-1;
  public long messageNo=-1;
 
 
  public SMSClient(int mode) {
      this.mode=mode;
    }
 
  public int sendMessage (String recipient, String message){
    this.recipient=recipient;
    this.message=message;
    //System.out.println("recipient: " + recipient + " message: " + message);
    myThread = new Thread(this);
    myThread.start();
//    run();
    return status;
    }
    public void run(){
 
    Sender aSender = new Sender(recipient,message);
 
    try{
      //send message
          aSender.send ();
 
         // System.out.println("sending ... ");
 
      //in SYNCHRONOUS mode wait for return : 0 for OK, -2 for timeout, -1 for other errors
      if (mode==SYNCHRONOUS) {
          while (aSender.status == -1){
            myThread.sleep (1000);
          }
      }
      if (aSender.status == 0) messageNo=aSender.messageNo ;
 
    }catch (Exception e){
 
        e.printStackTrace();
 
    }
 
    this.status=aSender.status ;
    aSender=null;
    }
    public static void main(String[]args){
        new SMSClient(0).sendMessage("recipient number here", "Message Here");
    }
}

this is the error message

javax.comm.NoSuchPortException
at javax.comm.CommPortIdentifier.getPortIdentifier(Co mmPortIdentifier.java:105)
at latest.SerialConnection.openConnection(SerialConne ction.java:76)
at latest.Sender.send(Sender.java:41)
at latest.SMSClient.run(SMSClient.java:36)
at java.lang.Thread.run(Thread.java:662)
java.lang.NullPointerException
at latest.SerialConnection.openConnection(SerialConne ction.java:93)
at latest.Sender.send(Sender.java:41)
at latest.SMSClient.run(SMSClient.java:36)
at java.lang.Thread.run(Thread.java:662)

i add this code to invoke SMSLient
public static void main(String[]args){
new SMSClient(0).sendMessage("recipient number here", "Message Here");
}
don't know if this is correct or not? any one try this? please help . . . no idea.

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