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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1140)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:143)	at javax.swing.JComponent.paintComponent(JComponent.java:763)	at javax.swing.JComponent.paint(JComponent.java:1027)	at javax.swing.JComponent.paintChildren(JComponent.java:864)	at javax.swing.JComponent.paint(JComponent.java:1036)	at javax.swing.JViewport.paint(JViewport.java:747)	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)	at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:277)	at javax.swing.RepaintManager.paint(RepaintManager.java:1217)	at javax.swing.JComponent._paintImmediately(JComponent.java:5070)	at javax.swing.JComponent.paintImmediately(JComponent.java:4880)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)	at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)	at java.awt.Dialog$1.run(Dialog.java:1051)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)