ragazzi scusate sono nuovissimo di java e so pochissimo oggi mi sono cimentato su un progetto che deve uplodare dei file su ftp ma mi dite dove sbaglio??

codice:
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * NumberAdditionUI.java
 *
 * Created on 29-gen-2009, 16.39.39
 */

package my.numeraddition;

/**
 *
 * @author corradocacciapuoti
 */
public class NumberAdditionUI extends javax.swing.JFrame {

    /** Creates new form NumberAdditionUI */
    public NumberAdditionUI() {
        initComponents();
    }

    /** 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() {

        jTabbedPane1 = new javax.swing.JTabbedPane();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton3.setText("Upload");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                .addContainerGap(136, Short.MAX_VALUE)
                .add(jButton3)
                .add(143, 143, 143))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                .addContainerGap(120, Short.MAX_VALUE)
                .add(jButton3)
                .add(112, 112, 112))
        );

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

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
FTPClient ftpClient = new FTPClient();
ftpClient.connect("ftp.foo.com", "user01", "pass1234");
ftpClient.download("C:\\Temp\\", "README.txt");
// Eventually other operations here ...
ftpClient.disconnect();
    }                                        

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NumberAdditionUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton3;
    private javax.swing.JTabbedPane jTabbedPane1;
    // End of variables declaration                   

}
uso netbeans su mac

ed ecco la schermata con gli errori: