java.lang.NullPointerException
   at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.access$300(SAXParserImpl.java:69)
   at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.setProperty(SAXParserImpl.java:545)
   at com.sun.org.apache.xml.internal.utils.XMLReaderManager.getXMLReader(XMLReaderManager.java:161)
   at com.sun.org.apache.xml.internal.dtm.ref.DTMManagerDefault.getXMLReader(DTMManagerDefault.java:613)
   at com.sun.org.apache.xalan.internal.xsltc.dom.XSLTCDTMManager.getDTM(XSLTCDTMManager.java:401)
   at com.sun.org.apache.xalan.internal.xsltc.dom.XSLTCDTMManager.getDTM(XSLTCDTMManager.java:252)
Caused: javax.xml.transform.TransformerException: java.lang.NullPointerException
   at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getDOM(TransformerImpl.java:581)
Caused: javax.xml.transform.TransformerException: javax.xml.transform.TransformerException: java.lang.NullPointerException
   at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:752)
   at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:353)
Caused: java.io.IOException: javax.xml.transform.TransformerException: javax.xml.transform.TransformerException: java.lang.NullPointerException
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper$1$1.run(GeneratedFilesHelper.java:339)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:609)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper$1.run(GeneratedFilesHelper.java:296)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper$1.run(GeneratedFilesHelper.java:289)
   at org.openide.util.Mutex.writeAccess(Mutex.java:443)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper.generateBuildScriptFromStylesheet(GeneratedFilesHelper.java:289)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper$3.run(GeneratedFilesHelper.java:816)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper$3.run(GeneratedFilesHelper.java:812)
   at org.openide.util.Mutex.writeAccess(Mutex.java:443)
   at org.netbeans.spi.project.support.ant.GeneratedFilesHelper.refreshBuildScript(GeneratedFilesHelper.java:812)
   at org.netbeans.modules.java.j2seproject.GeneratedFilesInterceptorSupport.refreshBuildScript(GeneratedFilesInterceptorSupport.java:81)
   at org.netbeans.modules.java.j2seproject.J2SEProject$ProjectXmlSavedHookImpl$1.run(J2SEProject.java:533)
   at org.netbeans.modules.java.j2seproject.J2SEProject$ProjectXmlSavedHookImpl$1.run(J2SEProject.java:501)
   at org.openide.util.Mutex.writeAccess(Mutex.java:443)
   at org.netbeans.modules.java.j2seproject.J2SEProject$ProjectXmlSavedHookImpl.projectXmlSaved(J2SEProject.java:501)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:645)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:113)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:151)
   at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:426)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:681)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:671)
   at org.openide.util.Mutex.writeAccess(Mutex.java:443)
   at org.netbeans.api.project.ProjectManager.saveProject(ProjectManager.java:671)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener.saveModifiedProject(CustomizerDialog.java:370)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener.access$500(CustomizerDialog.java:253)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1$1.run(CustomizerDialog.java:318)
   at org.openide.filesystems.FileUtil$2.run(FileUtil.java:431)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:609)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:415)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:435)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2$1.run(CustomizerDialog.java:309)
   at org.openide.util.Mutex.writeAccess(Mutex.java:404)
   at org.netbeans.modules.project.uiapi.CustomizerDialog$OptionListener$2.run(CustomizerDialog.java:306)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2042)