java.lang.IndexOutOfBoundsException: Index: -1, Size: 1
   at java.util.ArrayList.add(ArrayList.java:367)
   at org.netbeans.modules.xml.text.navigator.TreeNodeAdapter.elementAdded(TreeNodeAdapter.java:333)
   at org.netbeans.modules.editor.structure.api.DocumentElement.fireDocumentElementEvent(DocumentElement.java:364)
   at org.netbeans.modules.editor.structure.api.DocumentElement.fireDocumentElementEvent(DocumentElement.java:356)
   at org.netbeans.modules.editor.structure.api.DocumentElement.childAdded(DocumentElement.java:374)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.fireElementAddedEvent(DocumentModel.java:1052)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.commit(DocumentModel.java:993)
   at org.netbeans.modules.editor.structure.api.DocumentModel$DocumentModelModificationTransaction.access$200(DocumentModel.java:845)
   at org.netbeans.modules.editor.structure.api.DocumentModel$2.run(DocumentModel.java:519)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:127)
   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)