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java.lang.NullPointerException: 	at undefined.MouseAssignment.mouseClicked(	at java.awt.Component.processMouseEvent(	at java.awt.Component.processEvent(	at java.awt.Container.processEvent(	at java.awt.Window.processEvent(	at java.awt.Component.dispatchEventImpl(	at java.awt.Container.dispatchEventImpl(	at java.awt.Window.dispatchEventImpl(	at java.awt.Component.dispatchEvent(	at java.awt.EventQueue.dispatchEvent(	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(	at java.awt.EventDispatchThread.pumpEventsForHierarchy(	at java.awt.EventDispatchThread.pumpEvents(	at