Adding a Container within a Container

Why this coder is not working?
What should i do?

ERROR MESSAGE: "java.lang.IllegalArgumentException: illegal component position"

=============== Code ==================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;

/**
 *
 * @author  Agbeko Komla
 */
public class StudentSupportServices extends JFrame {
    private StudentPanel student;
    private CoursePanel course;
    private ProfessorPanel professor;
    private ExamPanel exam;
    private ControlPanel controls;

    private Connection connect;

   
    /** Creates a new instance of StudentInformations */
    public StudentSupportServices() {
       
        super("Student Support Services");

//These are all JPanels that i create externally        
        course = new CoursePanel();
        student = new StudentPanel();
        professor = new ProfessorPanel();
        exam = new ExamPanel();
        controls = new ControlPanel();


        Container studentAndCourseContentPane = getContentPane();
        studentAndCourseContentPane.setLayout( new FlowLayout( ) );
        studentAndCourseContentPane.add( student ) ;
        studentAndCourseContentPane.add( course ) ;

       
        Container professorAndExamContentPane = getContentPane();
        professorAndExamContentPane.setLayout( new FlowLayout( ) );
        professorAndExamContentPane.add( professor );
        professorAndExamContentPane.add( exam );

        JLayeredPane rootPane = getLayeredPane();                <=============== ERROR MESSAGE
        rootPane.add(studentAndCourseContentPane, BorderLayout.NORTH ) ;
        rootPane.add(professorAndExamContentPane , BorderLayout.CENTER );
        rootPane.add( controls, BorderLayout.SOUTH );
        //Container controlsContenPane = getContentPane();
        //controlsContenPane.add(controls, BorderLayout.SOUTH );
       
        pack();
        show();
    }
   
  public static void main( String [] args )
    {
       
       (new StudentSupportServices()).addWindowListener
        (
            new WindowAdapter()
            {
                public void windowClosing( WindowEvent e)
                {
                    System.exit( 0 );
                }
            }
        );
    }
}

==================
/*
 * ControlPanel.java
 *
 * Created on January 9, 2005, 3:10 AM
 */

package sss;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

/**
 *
 * @author  Agbeko Komla
 */
public class ControlPanel extends JPanel
{
    private JButton findData,findSchedule, addData, updateData, clear, help;
   
    /** Creates a new instance of ControlPanel */
    public ControlPanel()
    {
        super();
        setLayout(new FlowLayout(FlowLayout.RIGHT, 20, 10));
        setBorder(new CompoundBorder(
        BorderFactory.createLineBorder(Color.BLACK,1),
        BorderFactory.createBevelBorder(BevelBorder.RAISED)));
       
        findData = new JButton( "Find" );
        //add actionListner later
        add(findData);
       
        findSchedule = new JButton( "Schedule" );
        //add actionListner later
        add(findSchedule);
       
        addData = new JButton( "Add" );
        //add actionListner later
        add(addData);
       
        updateData = new JButton( "Update" );
        //add actionListner later
        add(updateData);
       
        clear = new JButton( "Clear" );
        //add actionListner later
        add(clear);
       
        help = new JButton( "Help" );
        //add actionListner later
        add(help);
    }
   
}

============================
/*
 * Course.java
 *
 * Created on January 19, 2005, 8:19 AM
 */

package sss;


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
 *
 * @author  Agbeko Komla
 */
public class CoursePanel extends JPanel
{
   
    /** Creates a new instance of Course */
    public CoursePanel()
    {
         super();
    }
   
}
========================
/*
 * StudentSchedule.java
 *
 * Created on January 9, 2005, 3:09 AM
 */

package sss;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

/**
 *
 * @author  Agbeko Komla
 */
public class ExamPanel extends JPanel
{        
    /** Creates a new instance of StudentSchedule */
   public ExamPanel()
    {
         super();
     
  }
}
========================
/*
 * Professor.java
 *
 * Created on January 19, 2005, 8:20 AM
 */

package sss;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 *
 * @author  Agbeko Komla
 */
public class ProfessorPanel extends JPanel
{
   
    /** Creates a new instance of Professor */
    public ProfessorPanel()
    {
         super();
    }
   
}
====================
/*
 * StudentPanel.java
 *
 * Created on January 9, 2005, 3:09 AM
 */

package sss;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
 *
 * @author  Agbeko Komla
 */
public class StudentPanel extends JPanel
{
    private String labels[] =
    {"ID:", "Last Name:", "First Name:", "Student Phone:", "Box #:"};
   
    JTextField last, first, id, phone, box;
    JTextField fields[] = {id, last, first, phone, box};
   
    /** Creates a new instance of StudentPanel */
    public StudentPanel()
    {
         super();
        /*
        for(int i = 0; i < fields.length; i++)
        {
            fields[i] = new JTextField(10);
            add( new JLabel( labels[i], JLabel.CENTER ));
            add( fields[i] );
        }
         */
        JPanel p1 = new JPanel( );
        //add actionListner later
        add(p1);
       
        JPanel p2 = new JPanel( );
        //add actionListner later
        add(p2);
       
    }
   
    public int getLabelLength()
    {
        return labels.length;
    }
}