org.w3c.dom.DOMException: HIERARCHY_REQUEST_ERR: An attempt was made to insert a node where it is not permitted. 
        at com.sun.org.apache.xerces.internal.dom.ParentNode.internalInsertBefore(ParentNode.java:356)
        at com.sun.org.apache.xerces.internal.dom.ParentNode.insertBefore(ParentNode.java:284)
        at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.insertBefore(CoreDocumentImpl.java:389)
        at com.sun.org.apache.xerces.internal.dom.NodeImpl.appendChild(NodeImpl.java:235)
        at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.cloneNode(CoreDocumentImpl.java:347)
        at com.sun.org.apache.xerces.internal.dom.DocumentImpl.cloneNode(DocumentImpl.java:155)
        at org.apache.tools.ant.module.xml.AntProjectSupport.getDocument(AntProjectSupport.java:161)
        at org.apache.tools.ant.module.xml.AntProjectSupport.getProjectElement(AntProjectSupport.java:297)
        at org.apache.tools.ant.module.loader.AntProjectDataEditor.annotateWithProjectName(AntProjectDataEditor.java:112)
        at org.apache.tools.ant.module.loader.AntProjectDataEditor.messageHtmlName(AntProjectDataEditor.java:101)
        at org.openide.text.CloneableEditor$2.run(CloneableEditor.java:755)
        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: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)