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java.lang.NullPointerException: 	at sun.awt.image.SunVolatileImage.isGCValid(Unknown Source)	at sun.awt.image.SunVolatileImage.validate(Unknown Source)	at javax.swing.JComponent.paintDoubleBuffered(Unknown Source)	at javax.swing.JComponent.paint(Unknown Source)	at java.awt.GraphicsCallback$PaintCallback.run(Unknown Source)	at sun.awt.SunGraphicsCallback.runOneComponent(Unknown Source)	at sun.awt.SunGraphicsCallback.runComponents(Unknown Source)	at java.awt.Container.paint(Unknown Source)	at sun.awt.RepaintArea.paint(Unknown Source)	at sun.awt.windows.WComponentPeer.handleEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)