java.lang.IndexOutOfBoundsException: Index: -1, Size: 52
   at java.util.ArrayList.rangeCheckForAdd(ArrayList.java:612)
   at java.util.ArrayList.add(ArrayList.java:426)
   at org.netbeans.modules.xml.text.navigator.TreeNodeAdapter.elementAdded(TreeNodeAdapter.java:336)
   at org.netbeans.modules.editor.structure.api.DocumentElement.fireDocumentElementEvent(DocumentElement.java:367)
   at org.netbeans.modules.editor.structure.api.DocumentElement.fireDocumentElementEvent(DocumentElement.java:359)
   at org.netbeans.modules.editor.structure.api.DocumentElement.childAdded(DocumentElement.java:377)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.fireElementAddedEvent(DocumentModel.java:1055)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.commit(DocumentModel.java:996)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.access$200(DocumentModel.java:848)
   at org.netbeans.modules.editor.structure.api.DocumentModel$2.run(DocumentModel.java:522)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:241)
   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)