This is the code

 void CreateGUI()
      {
          try
            {           
                //myPicture = ImageIO.read(new File("Companylogo_FINAL.jpg"));
                myPicture = ImageIO.read(new File("Companylogo_FINAL.jpg"));
              //myPicture = ImageIO.read(getClass().getResource("Companylogo_FINAL.jpg"));
              /*java.net.URL u = getClass().getResource("/resources/Companylogo_FINAL.jpg");
                System.out.println(u);
                myPicture = ImageIO.read(u);*/      

                /*try {*/
                    //myPicture = ImageIO.read(new File("Companylogo_FINAL.jpg"));
                /*} 
          catch (IOException e) 
          {
                }*/

                ImageIcon img = new ImageIcon(myPicture);
                //frame.setIconImage(img.getImage());
            } 
            catch (IOException e1)
            {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }


                          nameTextField = new JTextField(20);
            birthDateTextField = new JTextField(20);
            lastnameTextField = new JTextField(20);

            nameLabel = new JLabel("Name:");
            birthDateLabel = new JLabel("Birth Date:");
            lastnameLabel = new JLabel("Last Name:");


            JLabel lbl = new JLabel(new ImageIcon(myPicture));

            panel.setLayout(new MigLayout("fillx,filly", "[]rel:push[]", "[]1[]"));

            //ADD A TABBED PANE         
            panel.setBorder(BorderFactory.createTitledBorder("New Company :"));

            panel.add(lbl,"wrap, dock north, align right,gapbottom 10");
            buttonpanel.add(createbtn);
            buttonpanel.add(editbtn);
            editbtn.setVisible(true);
            buttonpanel.add(firstbtn);
            firstbtn.setVisible(false);
            buttonpanel.add(previousbtn);
            previousbtn.setVisible(false);
            buttonpanel.add(nextbtn);
            nextbtn.setVisible(false);
            buttonpanel.add(lastbtn);
            lastbtn.setVisible(false);
            buttonpanel.add(updatebtn);
            updatebtn.setVisible(false);
            buttonpanel.add(printbtn);
            printbtn.setVisible(false);
            buttonpanel.add(delbtn);
            delbtn.setVisible(false);
            buttonpanel.add(cancelbtn); 
            buttonpanel.add(currenttime);
            panel.add(nameLabel);          
            panel.add(nameTextField,"align label");         
            panel.add(lastnameLabel,       "gap related");
            panel.add(lastnameTextField,   "wrap,align label");
            panel.add(birthDateLabel,        "gap related");
            panel.add(birthDateTextField,"align label");


            JPanel widget1 = new JPanel();
            JPanel widget2 = new JPanel();
            JPanel widget3 = new JPanel();
            panel.add(widget1, "west, gapright 5, w 80");
            panel.add(widget2, "east, gapright 5, w 80");
            panel.add(widget3, "south, gapbottom 100, w 80");       
            widget3.setBorder(BorderFactory.createTitledBorder("New Border :"));
            frame.add(widget3);
            frame.add(tabbedPane);
            frame.add(buttonpanel,BorderLayout.SOUTH);
            buttonpanel.setBackground(Color.WHITE);
            frame.add(panel);




            frame.add(tabbedPane);
            tabbedPane.add(panel);
            tabbedPane.add(Employer);
            tabbedPane.add(Attendance);
            tabbedPane.add(Salary);
            tabbedPane.addTab("Employer Details",Employer);
            tabbedPane.addTab("Make Monthly Salary",Salary);
            tabbedPane.addTab("Mark Attendance", Attendance);          
            tabbedPane.setFont( new Font( "Dialog", Font.BOLD|Font.ITALIC,12 ));
            Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize(); 
            int x=(int)((dimension.getWidth() - 760)/2);
            int y=(int)((dimension.getHeight() - 550)/2);
            frame.setLocation(x, y);
            frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            frame.pack();
            createbtn.requestFocusInWindow();
            frame.setVisible(true); 


      }

I'm not able to add panel to frame.Error on that line.

frame.add(widget3);

Error I'm getting is>

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Did you really mean to add the same JPanel both to another JPanel and an JFrame?

You seem to have a BorderLayout on your frame (see 82) yet I found three places where you add a component to that frame without specifying a location (80, 81, 89 - duplicate). Sticking components on top of each other often doesn't work.

Yes I have solved it this also.
Just added this line.

//public JFrame frame;
    JFrame frame = new JFrame("New Company!");
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