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This exception has no message.
java.lang.NullPointerException: 	at jpcsp.MainGUI.(MainGUI.java:237)	at jpcsp.MainGUI$76.run(MainGUI.java:2904)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:715)	at java.awt.EventQueue.access$400(EventQueue.java:82)	at java.awt.EventQueue$2.run(EventQueue.java:676)	at java.awt.EventQueue$2.run(EventQueue.java:674)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:86)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:685)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)