RMI binding error (In the Client GUI)

Hi,
I get error that it can't find the

>>myServerObject

That I defined in the main method:
>>myRMIInterface myServerObject = (myRMIInterface) Naming.lookup("rmi://"+serverName+"/myRMIImplInstance");

This  >>myServerObject
is called twice in the JTable >>>at

 private void makeRemainingTabs() {
              tabbedPane.addTab("View Courses", new JScrollPane(new JTable(new MyTableModel(myServerObject.getCoursesTaken(id)))));
          tabbedPane.addTab("View Requirements", new JScrollPane(new JTable(new MyTableModel(myServerObject.getRequiredCourses(id)))));


>>(myServerObject.getRequiredCourses(id)) returns a vector ---
It seems that I didn't declare such a Vector.....
Can't figure out how I do that ........
Need help

THe complete client side GUI class is as follows:



import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.lang.*;
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;


public class CoursePlanner extends JFrame  {
     private JTabbedPane tabbedPane;
   
       private int id = 1204;




  private void setGui() {
    try {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
               tabbedPane = new JTabbedPane();
      JPanel p = new JPanel();
               p.add(new JLabel("Some initial message to show"));
               tabbedPane.addTab("UST Course Planner", p);
      getContentPane().add(tabbedPane);
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

     private boolean logon() {
          return "secret".equals(JOptionPane.showInputDialog("Enter password"));
     }

     private void makeRemainingTabs() {
              tabbedPane.addTab("View Courses", new JScrollPane(new JTable(new MyTableModel(myServerObject.getCoursesTaken(id)))));
          tabbedPane.addTab("View Requirements", new JScrollPane(new JTable(new MyTableModel(myServerObject.getRequiredCourses(id)))));
     }






public static void main(String[] argv)
                {
                System.setSecurityManager(new RMISecurityManager());
                if (argv.length != 1)
                        {
                        System.out.println("usage: java myRMIClient <IP address of host running RMI server>");
                        System.exit(0);
                        }
                String serverName = argv[0];
                try
                        {
                        //bind server object to object in client
                        myRMIInterface myServerObject = (myRMIInterface) Naming.lookup("rmi://"+serverName+"/myRMIImplInstance");
                                    }
                catch(Exception e)
                        {
                        System.out.println("Exception occured: " + e);
                        System.exit(0);
                        }
                System.out.println("RMI connection successful");

    CoursePlanner f = new CoursePlanner();
    f.setGui();
    f.setSize(500, 300);
    f.setVisible(true);
          if (f.logon()) {
               f.makeRemainingTabs();
          }
  }

}








PLs let me know

Thanks.
_Esam
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