Why is the giving me this error (method does not return a value) PLEASE !!

Question

I have this code and it is giving me this error and I don't know how to fix it
can anyone out there tell me why
I have included the next line of code as I have had problems in the curly brackets in the past.
The error is
"Client.java": Error #: 466 : method does not return a value at line 941, column 3
Please help
THX TO ALL
private Date DOBFormat()
    try
      if
        (MonthjComboBox.getSelectedItem().equals("") || 
         DayjComboBox.getSelectedItem().equals("") ||
         YearjComboBox.getSelectedItem().equals("")){
      else
        String dateString = StringFromDateFields();
        SimpleDateFormat df = new SimpleDateFormat("dd/mm/yyyy");
        Date d = df.parse(StringFromDateFields());
        System.out.println("date="+d);
        return d;
    catch (ParseException pe)
      String d= System.getProperty("line.separator");
      JOptionPane.showMessageDialog( this,
       "Date format needs to be DD/MM/YYYY,"+ d +
       "You have enterd: "+ StringFromDateFields()   + d +
       "Please change the Date", "Date Format Error",
       JOptionPane.WARNING_MESSAGE);
      return  null;
  //File | Exit action performed
public void jMenuFileExit_actionPerformed(ActionEvent e) {
  System.exit(0);
  }

Answer 1

Fixed it needed to have a return null;
this is the code
if
        (MonthjComboBox.getSelectedItem().equals("") ||
         DayjComboBox.getSelectedItem().equals("") ||
         YearjComboBox.getSelectedItem().equals("")){
        return null;