Program Compiles, but Exception in thread "main" error is thrown

Question

Hello everybody,
I am getting the following error when I try to run my program. It compiles fine, but a Exception in thread "main" error is given when I try to run the program. This is the full error:
Exception in thread "main" java.lang.Error: Do not use KonnectHelpdeskFrame.add(
) use KonnectHelpdeskFrame.getContentPane().add() instead
        at javax.swing.JFrame.createRootPaneException(JFrame.java:446)
        at javax.swing.JFrame.addImpl(JFrame.java:472)
        at java.awt.Container.add(Container.java:298)
        at KonnectHelpdesk.main(KonnectHelpdesk.java:15)
Press any key to continue . . .The code that I beleive contributes to the error is below. I'm not sure what is causing the problem, so any help will be greatly appreciated. Thanks.
class VoiceMailEntryDialog extends JDialog
     public VoiceMailEntryDialog(JFrame owner)
          super(owner, "New Voicemail Entry", true);
          Container contentPane = getContentPane();
          GridBagLayout layout = new GridBagLayout();
          contentPane.setLayout(layout);
          JLabel numberLabel = new JLabel("Phone Number: ");
          JLabel dayCalledLabel = new JLabel("Day Customer Called: ");
          JLabel timeCalledLabel = new JLabel("Time Customer Called: ");
          JLabel firstNameLabel = new JLabel("First Name: ");
          JLabel lastNameLabel = new JLabel("Last Name: ");
          JLabel messageLabel = new JLabel("Message: ");
          JTextField phoneNumber = new JTextField(20);
          JTextField firstName = new JTextField(20);
          JTextField lastName = new JTextField(30);
          JTextArea message = new JTextArea(8, 30);
          message.setLineWrap(true);
          message.setBorder(BorderFactory.createEtchedBorder());
          JComboBox dayCalled = new JComboBox(new String[]
               "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday", "Monday"
          JComboBox timeCalled = new JComboBox(new String[]
               "9:30am - 9:59am", "10:00am - 10:59am", "11:00am - 11:59am", "12:00pm - 12:59pm",
               "1:00pm - 1:59pm", "2:00pm - 2:59pm", "3:00pm - 3:59pm", "4:00pm - 4:59pm",
               "5:00pm - 5:59pm", "6:00pm - 6:59pm", "7:00pm - 7:59pm", "8:00pm - 8:59pm",
               "9:00pm - 9:59pm", "10:00pm - 9:29am"
          ActionListener noMsgListener = new NoMessageChecked();
          JCheckBox noMessageCheckbox = new JCheckBox("Left no message");
          noMessageCheckbox.addActionListener(noMsgListener);
          JButton ok = new JButton("OK");
          ok.addActionListener(new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    setVisible(false);
          JButton cancel = new JButton("Cancel");
          cancel.addActionListener(new ActionListener()
               public void actionPerformed(ActionEvent evt)
                    setVisible(false);
          GridBagConstraints constraints = new GridBagConstraints();
          constraints.fill = GridBagConstraints.NONE;
          constraints.anchor = GridBagConstraints.EAST;
          constraints.weightx = 0;
          constraints.weighty = 0;
          add(numberLabel, constraints, 0, 0, 1, 1);
          add(dayCalledLabel, constraints, 0, 2, 1, 1);
          add(timeCalledLabel, constraints, 0, 4, 1, 1);
          setSize(400, 700);
     public void add(Component c, GridBagConstraints constraints, int x, int y, int w, int h)
          constraints.gridx = x;
          constraints.gridy = y;
          constraints.gridwidth = w;
          constraints.gridheight = h;
          getContentPane().add(c, constraints);
     private class NoMessageChecked implements ActionListener
          public void actionPerformed(ActionEvent event)
}

Answer 1

atmguy,
Thanks. It turns out the the line that was causing the problem was in the error message. I guess it helps to pay attention. You are correct in what the line says and changing it made the program run, but caused some other minor problems that I'll work out later. Thanks again for you help.
jerryrika