java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1453)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1507)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:373)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:245)
at com.apple.mrj.swing.ThemeButtonListener.mouseReleased(ThemeButtonListener.java:111)
at java.awt.Component.processMouseEvent(Component.java:3711)
at java.awt.Component.processEvent(Component.java:3540)
at java.awt.Container.processEvent(Container.java:1159)
at java.awt.Component.dispatchEventImpl(Component.java:2589)
at java.awt.Container.dispatchEventImpl(Container.java:1208)
at java.awt.Component.dispatchEvent(Component.java:2493)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2446)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2211)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2120)
at java.awt.Container.dispatchEventImpl(Container.java:1195)
at java.awt.Window.dispatchEventImpl(Window.java:966)
at java.awt.Component.dispatchEvent(Component.java:2493)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:334)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:126)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:88)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:80)

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