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java.lang.NullPointerException: 	at MouseAssignment.mouseClicked(MouseAssignment.java:34)	at java.awt.Component.processMouseEvent(Component.java:3713)	at java.awt.Component.processEvent(Component.java:3539)	at java.awt.Container.processEvent(Container.java:1159)	at java.awt.Window.processEvent(Window.java:788)	at java.awt.Component.dispatchEventImpl(Component.java:2588)	at java.awt.Container.dispatchEventImpl(Container.java:1208)	at java.awt.Window.dispatchEventImpl(Window.java:923)	at java.awt.Component.dispatchEvent(Component.java:2492)	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)