java.lang.NullPointerException
   at org.openide.nodes.EntrySupportLazy$LazySnapshot.get(EntrySupportLazy.java:885)
   at org.openide.nodes.FilterNode$Children$LazySupport$FilterNodeEntry.nodes(FilterNode.java:1897)
   at org.openide.nodes.EntrySupportLazyState$EntryInfo.getNode(EntrySupportLazyState.java:296)
   at org.openide.nodes.FilterNode$Children$LazySupport$FilterLazySnapshot.get(FilterNode.java:1752)
   at org.openide.nodes.FilterNode$Children$LazySupport$FilterNodeEntry.nodes(FilterNode.java:1897)
   at org.openide.nodes.EntrySupportLazyState$EntryInfo.getNode(EntrySupportLazyState.java:296)
   at org.openide.nodes.FilterNode$Children$LazySupport$FilterLazySnapshot.get(FilterNode.java:1752)
   at org.openide.nodes.EntrySupportLazy$LazySnapshot.get(EntrySupportLazy.java:880)
   at org.openide.nodes.EntrySupportLazy$LazySnapshot.get(EntrySupportLazy.java:865)
   at org.openide.explorer.view.VisualizerChildren.getChildAt(VisualizerChildren.java:127)
   at org.openide.explorer.view.VisualizerNode.getChildAt(VisualizerNode.java:321)
   at javax.swing.tree.DefaultTreeModel.getChild(DefaultTreeModel.java:174)
   at javax.swing.tree.FixedHeightLayoutCache$SearchInfo.getPath(FixedHeightLayoutCache.java:1465)
   at javax.swing.tree.FixedHeightLayoutCache.getPathForRow(FixedHeightLayoutCache.java:210)
   at javax.swing.plaf.basic.BasicTreeUI.getPathForRow(BasicTreeUI.java:546)
   at javax.swing.JTree.getPathForRow(JTree.java:2170)
   at javax.swing.JTree.getNextMatch(JTree.java:3014)
   at javax.swing.plaf.basic.BasicTreeUI$Handler.keyTyped(BasicTreeUI.java:3341)
   at java.awt.AWTEventMulticaster.keyTyped(AWTEventMulticaster.java:239)
   at java.awt.Component.processKeyEvent(Component.java:6460)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2828)
   at org.openide.explorer.view.TreeView$ExplorerTree.processKeyEvent(TreeView.java:1911)
   at java.awt.Component.processEvent(Component.java:6282)
   at java.awt.Container.processEvent(Container.java:2229)
   at java.awt.Component.dispatchEventImpl(Component.java:4861)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
   at java.awt.DefaultKeyboardFocusManager.pumpApprovedKeyEvents(DefaultKeyboardFocusManager.java:847)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:943)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:570)
   at java.awt.Component.dispatchEventImpl(Component.java:4731)
   at java.awt.Container.dispatchEventImpl(Container.java:2287)
   at java.awt.Component.dispatchEvent(Component.java:4687)
   at java.awt.KeyboardFocusManager.dispatchAndCatchException(KeyboardFocusManager.java:2538)
   at java.awt.KeyboardFocusManager.processCurrentLightweightRequests(KeyboardFocusManager.java:2634)
   at java.awt.KeyboardFocusManager$2.run(KeyboardFocusManager.java:2741)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
   at java.awt.EventQueue.access$200(EventQueue.java:103)
   at java.awt.EventQueue$3.run(EventQueue.java:694)
   at java.awt.EventQueue$3.run(EventQueue.java:692)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)