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java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.paintRow(BasicTreeUI.java:1413) at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1203) at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:152) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142) at javax.swing.JComponent.paintComponent(JComponent.java:742) at javax.swing.JComponent.paint(JComponent.java:1005) at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4963) at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4916) at javax.swing.JComponent._paintImmediately(JComponent.java:4859) at javax.swing.JComponent.paintImmediately(JComponent.java:4666) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:451) at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:114)