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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:1309)	at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1120)	at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:139)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:39)	at javax.swing.JComponent.paintComponent(JComponent.java:395)	at javax.swing.JComponent.paint(JComponent.java:687)	at javax.swing.JComponent.paintWithBuffer(JComponent.java:3878)	at javax.swing.JComponent._paintImmediately(JComponent.java:3821)	at javax.swing.JComponent.paintImmediately(JComponent.java:3672)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:370)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:124)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:154)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:337)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)