Exception: wrong parent for CardLayout

[Allen Bandela]

Hi everybody,
I am creating a GUI for an application. I am setting the frame with CardLayout. But, I am getting runtime exception "java.lang.IllegalArgumentException: wrong parent for CardLayout"
while executing the cardLayout.show(Container parent, Object constraints) method. I made sure the parent was the one which has the card layout set to it. Please help.
The program is below.
public class LoginGUI implements ActionListener{

  public void createAndShowGUI(){
//Creating the Exam modules frame
exams=new JFrame();
cl=new CardLayout();
exams.setLayout(cl);

 
//Creating Panel p2
JPanel p2=new JPanel();
DefaultListModel model=new DefaultListModel();
final JList list=new JList(model);
model.add(0, "Module 1");
model.add(1, "Module 2");
model.add(2, "Module 3");
JButton submit=new JButton("Submit");
p2.add(list);
p2.add(submit);

JPanel p3=new JPanel();
JPanel p4=new JPanel();
JPanel p5=new JPanel();
JButton button1=new JButton("Module 1");
JButton button2=new JButton("Module 2");
JButton button3=new JButton("Module 3");
p3.add(button1);
p4.add(button2);
p5.add(button3);

        //[B]Adding the panels to the "exams" JFrame[/B]
        exams.add(p2,"first");
        exams.add(p3,"second");
exams.add(p4,"third");
exams.add(p5,"fourth");
 
//Adding Panel p2 to exams frame

button.addActionListener(this);
submit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
switch(list.getSelectedIndex()){
case 0: LoginGUI.this.cl.show(LoginGUI.this.exams,"second"); [B]//Exception occuring here when I select the first item in the list and click the "submit" button[/B]
case 1:LoginGUI.this.cl.show(LoginGUI.this.exams, "third");
case 2:LoginGUI.this.cl.show(LoginGUI.this.exams, "fourth");
}
}
});
}
}  

[Michael Dunn]

LoginGUI.this.exams
should be
LoginGUI.this.exams.getContentPane()