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java.lang.NullPointerException: 	at Exchange$3.actionPerformed(Exchange.java:107)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1453)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1507)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:373)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:245)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:211)	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)