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java.lang.NullPointerException: 	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:2009)	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:1974)	at javax.swing.plaf.basic.BasicTreeUI$Handler.valueChanged(BasicTreeUI.java:3637)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:629)	at javax.swing.tree.DefaultTreeSelectionModel.clearSelection(DefaultTreeSelectionModel.java:570)	at javax.swing.tree.VariableHeightLayoutCache.rebuild(VariableHeightLayoutCache.java:740)	at javax.swing.tree.VariableHeightLayoutCache.treeStructureChanged(VariableHeightLayoutCache.java:626)	at javax.swing.plaf.basic.BasicTreeUI$Handler.treeStructureChanged(BasicTreeUI.java:3824)	at com.hyperion.install.wizard.swing.FeatureTreeModel.fireStructureChanged(FeatureTreeModel.java:511)	at com.hyperion.install.wizard.swing.FeatureTreeModel.fireStructureChanged(FeatureTreeModel.java:520)	at com.hyperion.install.wizard.swing.TreeSelectionFieldSwingImpl$11.run(TreeSelectionFieldSwingImpl.java:311)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)	at java.awt.EventQueue.access$000(EventQueue.java:84)	at java.awt.EventQueue$1.run(EventQueue.java:602)	at java.awt.EventQueue$1.run(EventQueue.java:600)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)	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)