java.lang.AssertionError: Index of v has been computed by recomputeIndexes
        at org.openide.explorer.view.VisualizerChildren.getIndex(VisualizerChildren.java:156)
        at org.openide.explorer.view.VisualizerNode.getIndex(VisualizerNode.java:277)
        at javax.swing.tree.DefaultTreeModel.getIndexOfChild(DefaultTreeModel.java:142)
        at javax.swing.tree.FixedHeightLayoutCache.getRowForPath(FixedHeightLayoutCache.java:217)
        at javax.swing.tree.AbstractLayoutCache.getRowsForPaths(AbstractLayoutCache.java:443)
        at javax.swing.tree.DefaultTreeSelectionModel.resetRowSelection(DefaultTreeSelectionModel.java:760)
        at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:284)
        at org.openide.explorer.view.BeanTreeView.showSelection(BeanTreeView.java:127)
        at org.openide.explorer.view.TreeView.synchronizeSelectedNodes(TreeView.java:879)
        at org.openide.explorer.view.TreeView$TreePropertyListener.propertyChange(TreeView.java:1131)
        at org.openide.util.WeakListenerImpl$PropertyChange.propertyChange(WeakListenerImpl.java:186)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.openide.explorer.ExplorerManager$2.run(ExplorerManager.java:855)
        at org.openide.util.Mutex.doEvent(Mutex.java:1335)
        at org.openide.util.Mutex.readAccess(Mutex.java:345)
        at org.openide.explorer.ExplorerManager.fireInAWT(ExplorerManager.java:852)
        at org.openide.explorer.ExplorerManager$1AtomicSetSelectedNodes.fire(ExplorerManager.java:272)
        at org.openide.explorer.ExplorerManager.setSelectedNodes(ExplorerManager.java:285)
        at org.openide.explorer.ExplorerManager$1SetExploredContextAndSelection.run(ExplorerManager.java:379)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.openide.explorer.ExplorerManager.setExploredContextAndSelection(ExplorerManager.java:400)
        at org.netbeans.modules.favorites.Actions$Add$1.run(Actions.java:453)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)