How can I deal with error 200621 and 200279?

Hi, I am new to Labview. I was asked to use Labview to do some basic frequency-domain analysis for my homework. The hardware I use is myDAQ student instrumentation device. Basically, I am asked to transfer audio signal from MP3 to Labview by using the audio in jack on myDAQ, and transfer the editted signal to a speaker by using the audio out jack. Also, I was asked to have a toggle to let users alter from music to white noise.
Here's the problem. If I do not switch between white noise and music, it works well. But as long as I click the toggle, either error 200621 or error 200279 will appear. And I referred to the help file (http://digital.ni.com/public.nsf/allkb/AB7D4CA85967804586257380006F0E62), but I still have no idea how to solve the problem. Could anybody give me a detailed instruction, thanks.
vi file mentioned above is attached
Attachments:
HW1.vi ‏197 KB
Vm495+HW_1.pdf ‏153 KB

Take a look at:
Getting Started with NI-DAQmx: Getting Started with NI-DAQmx Programming in LabVIEW
Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications
You can also find a lot of DAQmx examples with Find Examples under the Help menu.
Also, if you right click on a DAQ assistant and choose Open Front Panel, it turns it into a subVI where you can look under the hood and see how the DAQ assistant is doing its job with the basic DAQmx functions.
For queues, look for examples for that as well. And also look for the design templates under File / New... for Producer/Consumer architecture. Also do more searching on the forums for questions and answers about queues and producer/consumer.

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* Copyright 1998, 1999 Sun Microsystems, Inc. All Rights Reserved.
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import java.io.*;
import java.util.*;
import java.text.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
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String passwd = req.getParameter("password");
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 ServletOutputStream out)
 throws IOException {
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boolean tf = true;
out.print("To: ");
for (int i = 0; i < to.length; i++) {
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out.print("CC: ");
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 out.print("Subject: " +
 ((msg.getSubject() !=null) ? msg.getSubject() : "") +
 " ");
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 out.println(msg.toString());
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 out.println("Date</td>");
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 ServletOutputStream out, HttpSession ssn)
 throws IOException {
String to = req.getParameter("to");
 String cc = req.getParameter("cc");
 String subj = req.getParameter("subject");
 String text = req.getParameter("text");
 try {
 MailUserData mud = getMUD(ssn);
 if (mud == null)
 throw new Exception("trying to send, but not logged in");
 Message msg = new MimeMessage(mud.getSession());
 InternetAddress[] toAddrs = null, ccAddrs = null;
 if (to != null) {
 toAddrs = InternetAddress.parse(to, false);
 msg.setRecipients(Message.RecipientType.TO, toAddrs);
 } else
 throw new MessagingException("No \"To\" address specified");
 if (cc != null) {
 ccAddrs = InternetAddress.parse(cc, false);
 msg.setRecipients(Message.RecipientType.CC, ccAddrs);
 if (subj != null)
 msg.setSubject(subj);
 URLName u = mud.getURLName();
 msg.setFrom(new InternetAddress(u.getUsername() + "@" +
 u.getHost()));
 if (text != null)
 msg.setText(text);
 Transport.send(msg);
 out.println("<h1>Message sent successfully</h1></body></html>");
 out.close();
 } catch (Exception mex) {
 out.println("<h1>Error sending message.</h1>");
 out.println(mex.toString());
 out.println(" </body></html>");
// utility method; returns a string suitable for msg header display
private String getDisplayAddress(Address a) {
String pers = null;
String addr = null;
if (a instanceof InternetAddress &&
((pers = ((InternetAddress)a).getPersonal()) != null)) {
 addr = pers + " "+"<"+((InternetAddress)a).getAddress()+">";
} else
addr = a.toString();
return addr;
// utility method; retrieve the MailUserData
// from the HttpSession and return it
private MailUserData getMUD(HttpSession ses) throws IOException {
 MailUserData mud = null;
 if (ses == null) {
 return null;
 } else {
 if ((mud = (MailUserData)ses.getValue("javamailservlet")) == null){
 return null;
 return mud;
public String getServletInfo() {
return "A mail reader servlet";
* This is the HTML code for the compose form. Another option would
* have been to use a separate html page.
private static String composeForm = "<HTML><HEAD><TITLE>JavaMail Compose</TITLE></HEAD><BODY BGCOLOR=\"#CCCCFF\"><FORM ACTION=\"/servlet/JavaMailServlet\" METHOD=\"POST\"><input type=\"hidden\" name=\"send\" value=\"send\">JavaMail Compose Message<TABLE BORDER=\"0\" WIDTH=\"100%\"><TR><TD WIDTH=\"16%\" HEIGHT=\"22\"> To:</TD><TD WIDTH=\"84%\" HEIGHT=\"22\"><INPUT TYPE=\"TEXT\" NAME=\"to\" SIZE=\"30\"> (separate addresses with commas)</TD></TR><TR><TD WIDTH=\"16%\">CC:</TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"cc\" SIZE=\"30\"> (separate addresses with commas)</TD></TR><TR><TD WIDTH=\"16%\">Subject:</TD><TD WIDTH=\"84%\"><INPUT TYPE=\"TEXT\" NAME=\"subject\" SIZE=\"55\"></TD></TR><TR><TD WIDTH=\"16%\"> </TD><TD WIDTH=\"84%\"><TEXTAREA NAME=\"text\" ROWS=\"15\" COLS=\"53\"></TEXTAREA></TD></TR><TR><TD WIDTH=\"16%\" HEIGHT=\"32\"> </TD><TD WIDTH=\"84%\" HEIGHT=\"32\"><INPUT TYPE=\"SUBMIT\" NAME=\"Send\" VALUE=\"Send\"><INPUT TYPE=\"RESET\" NAME=\"Reset\" VALUE=\"Reset\"></TD></TR></TABLE></FORM></BODY></HTML>";
* This class is used to store session data for each user's session. It
* is stored in the HttpSession.
class MailUserData {
URLName url;
Session session;
Store store;
Folder folder;
public MailUserData(URLName urlname) {
 url = urlname;
public URLName getURLName() {
 return url;
public Session getSession() {
 return session;
public void setSession(Session s) {
 session = s;
public Store getStore() {
 return store;
public void setStore(Store s) {
 store = s;
public Folder getFolder() {
 return folder;
public void setFolder(Folder f) {
 folder = f;

You posted a thousand lines of badly-formatted code and didn't have the sense to say which one had the exception.
My guess is that it was this one:Session session = Session.getDefaultInstance(props, null);because that happened to me. I fixed it by calling getInstance instead of getDefaultInstance.
However if that isn't the problem, how about spending a few seconds to post a less useless question?

How can I deal with error 200621 and 200279?

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