Logout: Error

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package ticketing;



import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
 *
 * @author ta
 */
public class Board extends javax.swing.JFrame {

    /**
     * Creates new form Board
     */
    public Board() {
        initComponents();
        this.setExtendedState(JFrame.MAXIMIZED_BOTH);
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        MenuBar = new javax.swing.JMenuBar();
        mSystem = new javax.swing.JMenu();
        itUser = new javax.swing.JMenuItem();
        itLogout = new javax.swing.JMenuItem();
        itExit = new javax.swing.JMenuItem();
        mMaster = new javax.swing.JMenu();
        itTicket = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        MenuBar.setToolTipText("allMenu");

        mSystem.setText("System");
        mSystem.setToolTipText("system");

        itUser.setText("User");
        itUser.setToolTipText("user");
        itUser.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                itUserActionPerformed(evt);
            }
        });
        mSystem.add(itUser);

        itLogout.setText("Logout");
        itLogout.setToolTipText("logout");
        itLogout.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                itLogoutActionPerformed(evt);
            }
        });
        mSystem.add(itLogout);

        itExit.setText("Exit");
        itExit.setToolTipText("exit");
        itExit.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                itExitActionPerformed(evt);
            }
        });
        mSystem.add(itExit);

        MenuBar.add(mSystem);

        mMaster.setText("Master");
        mMaster.setToolTipText("master");

        itTicket.setText("Ticket");
        itTicket.setToolTipText("ticket");
        itTicket.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                itTicketActionPerformed(evt);
            }
        });
        mMaster.add(itTicket);

        MenuBar.add(mMaster);

        setJMenuBar(MenuBar);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 279, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>

    private void itUserActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    private void itExitActionPerformed(java.awt.event.ActionEvent evt) {
         int result = JOptionPane.showConfirmDialog(this,
        "Apakah Anda akan keluar dari system?",
        "Keluar dari system", JOptionPane.YES_NO_OPTION);
if (result == JOptionPane.YES_OPTION) System.exit(0);


    }

    private void itTicketActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
    }

    private void itLogoutActionPerformed(java.awt.event.ActionEvent evt) {
        Login Log =  new Login();
        Log.setTitle("Login");
        Log.setVisible(true);
        this.dispose();

    }

    private void itLogoutActionPerformed(java.awt.event.ActionEvent){
        try{
            Login Log = new Login();
            Log.setTitle("Login");
            Log.setVisible(true);
            this.dispose();
        } catch (IOException ex){
                Logger.getLogger(Board.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Board.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Board.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Board.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Board.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Board().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify
    private javax.swing.JMenuBar MenuBar;
    private javax.swing.JMenuItem itExit;
    private javax.swing.JMenuItem itLogout;
    private javax.swing.JMenuItem itTicket;
    private javax.swing.JMenuItem itUser;
    private javax.swing.JMenu mMaster;
    private javax.swing.JMenu mSystem;
    // End of variables declaration


}