java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at undefined.PianoApplet.paint(PianoApplet.java)
at sun.awt.RepaintArea.paint(RepaintArea.java:293)
at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:191)
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)

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