java.lang.NoClassDefFoundError: Could not initialize class com.sun.org.apache.xerces.internal.impl.xs.traversers.XSAttributeChecker
   at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.createTraversers(XSDHandler.java:1851)
   at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.prepareForTraverse(XSDHandler.java:1921)
   at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:567)
   at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:552)
   at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:519)
   at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadGrammar(XMLSchemaLoader.java:485)
   at com.sun.org.apache.xerces.internal.jaxp.validation.XMLSchemaFactory.newSchema(XMLSchemaFactory.java:210)
   at org.netbeans.modules.project.ant.ProjectXMLCatalogReader.projectXmlCombinedSchema(ProjectXMLCatalogReader.java:187)
   at org.netbeans.modules.project.ant.ProjectXMLCatalogReader.validate(ProjectXMLCatalogReader.java:152)
   at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.loadProjectXml(AntBasedProjectFactorySingleton.java:291)
   at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.loadProject(AntBasedProjectFactorySingleton.java:223)
   at org.netbeans.api.project.ProjectManager.createProject(ProjectManager.java:354)
   at org.netbeans.api.project.ProjectManager.access$300(ProjectManager.java:80)
   at org.netbeans.api.project.ProjectManager$2.run(ProjectManager.java:275)
   at org.netbeans.api.project.ProjectManager$2.run(ProjectManager.java:227)
   at org.openide.util.Mutex.readAccess(Mutex.java:327)
   at org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:227)
   at org.netbeans.modules.project.ui.OpenProjectList.fileToProject(OpenProjectList.java:988)
   at org.netbeans.modules.project.ui.ProjectChooserAccessory.getProject(ProjectChooserAccessory.java:399)
   at org.netbeans.modules.project.ui.ProjectChooserAccessory.access$000(ProjectChooserAccessory.java:85)
   at org.netbeans.modules.project.ui.ProjectChooserAccessory$1.run(ProjectChooserAccessory.java:253)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:577)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1030)