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java.lang.NullPointerException: 	at PianoApplet.paint(PianoApplet.java)	at java.awt.Container.update(Container.java:976)	at sun.awt.RepaintArea.update(RepaintArea.java:332)	at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:195)	at java.awt.Component.dispatchEventImpl(Component.java:2658)	at java.awt.Container.dispatchEventImpl(Container.java:1208)	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)