org.xml.sax.SAXParseException: The element type "head" must be terminated by the matching end-tag "</head>".
        at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:239)
        at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
        at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:124)
        at org.netbeans.modules.uihandler.Installer.parseButtons(Installer.java:1015)
        at org.netbeans.modules.uihandler.Installer$Submit.doShow(Installer.java:1418)
        at org.netbeans.modules.uihandler.Installer.doDisplaySummary(Installer.java:969)
        at org.netbeans.modules.uihandler.Installer.displaySummary(Installer.java:900)
        at org.netbeans.modules.uihandler.Installer.displaySummary(Installer.java:908)
        at org.netbeans.modules.uihandler.UIHandler.run(UIHandler.java:140)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)