Problems with running compiled code

Hello there,
I have an MTA application called power mta which has a java api to send email into it. I have placed the jar file provided into the jre/lib/ext directory and the example code compiled without a problem. However, when I run the app I get the following error:

C:\Documents and Settings\Administrator\Desktop\MPFeeder\examples>java ExampleMe
ssage
Exception in thread "main" java.lang.NoClassDefFoundError: com/port25/pmta/api/s
ubmitter/EmailAddressException

What does this error mean? I have called them about this and they say they cant duplicate the error. Here is the ExampleMessage.java code:

import java.io.IOException;
import com.port25.pmta.api.submitter.*;

/*
 * Example for usage of the Java PMTA Submitter API.
 *
 * Copyright 2002 by Port25 Solutions, Inc.
 * All rights reserved.
 *
 * Don't forget to set the LD_LIBRARY_PATH environment variable to include
 * the directory where libpmtajava.so (or pmtajava.dll) is in, e.g. on
 * Linux and with bash use
 *      export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib/
 * if it is not in the default library path.
 *
 * $Id: ExampleMessage.java,v 1.15 2004/06/02 14:24:43 robert Exp $
 *
 */
public class ExampleMessage {
    public static void main(String args[]) {
        String text =
            "Subject: Sent using the PMTA Java API\n" +
            "To: To You <rick@infotech.com>\n" +
            "From: From Me <rick@infotech.com>\n" +
            "\n" +
            "This message was sent via PowerMTA's native Java API.\n";
        Message msg = new Message("rick@infotech.com");
        try {
            Recipient rcpt = new Recipient("rick@infotech.com");
            msg.addRecipient(rcpt);
            msg.setReturnType(Message.RETURN_FULL);
            msg.addDateHeader();
            msg.setEncoding(Message.ENCODING_8BIT);
            msg.addData(text.getBytes());
            Connection conn = new Connection("local:");
            conn.submit(msg);
        }
        catch (ServiceException se) {
            se.printStackTrace();
        }
        catch (EmailAddressException eae) {
            eae.printStackTrace();
        }
        catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
}


Can someone please tell me what I am doing wrong? The correct fix is worth 500 points.

Thanks,
Rick