Exception while sending message to MSMQ

Hi All,
           I am trying to write a simple test to send a message to an
existing Queue on MQMS from my java test client using jawin. I am getting
the following exception. Also I am posting the code for my test client.
Any ideas as to where I am going wrong?

Thanks in advance
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org.jawin.COMException: 8000ffff: Unable to serialize variant:
org.jawin.Variant@1fee6fc
 at org.jawin.Variant.writeVariant(Variant.java:347)
 at org.jawin.Variant.writeObject(Variant.java:251)
 at org.jawin.Variant.writeArray(Variant.java:434)
 at org.jawin.Variant.writeObject(Variant.java:218)
 at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:579)
 at org.jawin.DispatchPtr.invokeN(DispatchPtr.java:555)
 at com.test.java2com.IMSMQMessage.Send(IMSMQMessage.java:587)
 at com.test.java2com.MSMQTest.main(MSMQTest.java:28)
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package com.test.java2com;

import org.jawin.*;

public class MSMQTest
{
 public static void main(String[] args)
 {
  try
  {
   String queueName = ".\\private$\\MyQueue";
   IMSMQQueueInfo2 msmqQInfo = new IMSMQQueueInfo2
("MSMQ.MSMQQueueInfo");
   msmqQInfo.setPathName (queueName);
   msmqQInfo.setLabel(queueName);
   IMSMQQueue2 queue = msmqQInfo.Open
(MQACCESS.MQ_SEND_ACCESS ,MQSHARE.MQ_DENY_NONE);
   //IMSMQEvent2 msmqEvent = new IMSMQEvent2
("MSMQ.MSMQEvent");

   IMSMQMessage msmqMessage = new IMSMQMessage
("MSMQ.MSMQMessage");
   // set message properties
   msmqMessage.put("Label", "test");
   msmqMessage.put("Body", "hello world!");
   //Dispatch.put(msmqMessage, "AppSpecific", new
Integer(0));

   Object[] q = new Object[]{msmqQInfo};
   Variant v1 = new Variant();
   v1.boolVal = false;
   Variant[] v = new Variant[]{v1};
   msmqMessage.Send(q, v);

   System.out.println("Successfully completed test");

  }
  catch(Exception exc)
  {
   exc.printStackTrace();
  }
 }
}
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