[JAVA3D] how to solute that problem

[SUBSCRIBE JAVA3D-INTEREST peter]

dear all
i had created a button that is used to remove a BG child when the button is pressed.

  final Button button1 = new Button("Stop");
  button1.addActionListener( new ActionListener() {
  public void actionPerformed(ActionEvent e)
  {
    processAction();
  });

private void processAction()
{
     scene.removeChild();
}
 And when compile , it is no error. but when run, when i press the
button
it show the error like below


"Exception occured during event dispatching:
 java.lang.NullPointerException:
   at Test.processAction (Test.java:876)
   at Test.processEvent(button.java,compiled code);
   at java.awt.Button.processActionEvent(Button.java:308)
   at java.awt.Button.processEvent(Button.java:281)
   at java .awt.EventQuene.dispatcheveny(eventquene.java,compile code);
....
"
can anyone help me? ugrency

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