org.apache.xerces.impl.dv.DVFactoryException: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory.
   at org.apache.xerces.impl.dv.DTDDVFactory.getInstance(DTDDVFactory.java:0)
   at org.apache.xerces.impl.dv.DTDDVFactory.getInstance(DTDDVFactory.java:0)
   at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.<init>(SchemaParsingConfig.java:0)
   at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.<init>(SchemaParsingConfig.java:0)
   at org.apache.xerces.impl.xs.traversers.XSDHandler.<init>(XSDHandler.java:0)
   at org.apache.xerces.impl.xs.traversers.XSDHandler.<init>(XSDHandler.java:0)
   at org.apache.xerces.impl.xs.XMLSchemaLoader.<init>(XMLSchemaLoader.java:0)
   at org.apache.xerces.impl.xs.XMLSchemaLoader.<init>(XMLSchemaLoader.java:0)
   at org.apache.xerces.impl.xs.XMLSchemaValidator.<init>(XMLSchemaValidator.java:0)
   at org.apache.xerces.jaxp.validation.XMLSchemaValidatorComponentManager.<init>(XMLSchemaValidatorComponentManager.java:0)
   at org.apache.xerces.jaxp.validation.ValidatorImpl.<init>(ValidatorImpl.java:0)
   at org.apache.xerces.jaxp.validation.AbstractXMLSchema.newValidator(AbstractXMLSchema.java:0)
   at org.openide.xml.XMLUtil.validate(XMLUtil.java:478)
   at org.netbeans.modules.project.ant.ProjectXMLCatalogReader.validate(ProjectXMLCatalogReader.java:154)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.loadXml(AntProjectHelper.java:307)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.getConfigurationXml(AntProjectHelper.java:259)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.getConfigurationDataRoot(AntProjectHelper.java:418)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.access$1400(AntProjectHelper.java:108)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$11.run(AntProjectHelper.java:977)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$11.run(AntProjectHelper.java:974)
   at org.openide.util.Mutex.writeAccess(Mutex.java:397)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.removeConfigurationFragment(AntProjectHelper.java:974)
   at org.netbeans.spi.project.support.ant.ExtensibleMetadataProviderImpl.removeConfigurationFragment(ExtensibleMetadataProviderImpl.java:101)
   at org.netbeans.modules.projectapi.AuxiliaryConfigImpl$3.run(AuxiliaryConfigImpl.java:278)
   at org.netbeans.modules.projectapi.AuxiliaryConfigImpl$3.run(AuxiliaryConfigImpl.java:273)
   at org.openide.util.Mutex.writeAccess(Mutex.java:397)
   at org.netbeans.modules.projectapi.AuxiliaryConfigImpl.removeConfigurationFragment(AuxiliaryConfigImpl.java:273)
   at org.netbeans.modules.project.ui.ProjectUtilities.storeProjectOpenFiles(ProjectUtilities.java:469)
   at org.netbeans.modules.project.ui.ProjectUtilities.closeAllDocuments(ProjectUtilities.java:460)
   at org.netbeans.modules.project.ui.OpenProjectList.close(OpenProjectList.java:759)
   at org.netbeans.modules.project.ui.actions.CloseProject.actionPerformed(CloseProject.java:85)
   at org.netbeans.modules.project.ui.actions.CloseProject$1.run(CloseProject.java:78)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1957)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: org.apache.xerces.impl.dv.DVFactoryException: DTD factory class org.apache.xerces.impl.dv.dtd.DTDDVFactoryImpl does not extend from DTDDVFactory.
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:422)
   at org.netbeans.modules.project.ui.actions.CloseProject.actionPerformed(CloseProject.java:75)
   at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.actionPerformed(LookupSensitiveAction.java:169)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
   at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
   at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1223)
   at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1264)
   at java.awt.Component.processMouseEvent(Component.java:6263)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6028)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4574)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4238)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
   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)