used also Netbeans 4.2-dev (2005-08-07).
got the same XML parsing error:

org.w3c.dom.DOMException: NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.setName(AttrNSImpl.java:146)
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.<init>(AttrNSImpl.java:115)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.createAttributeNS(CoreDocumentImpl.java:2109)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.importNode(CoreDocumentImpl.java:1622)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.importNode(CoreDocumentImpl.java:1586)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.importNode(CoreDocumentImpl.java:1528)
at org.netbeans.spi.project.support.ant.AntProjectHelper.cloneSafely(AntProjectHelper.java:824)
at org.netbeans.spi.project.support.ant.AntProjectHelper.access$1400(AntProjectHelper.java:65)
at org.netbeans.spi.project.support.ant.AntProjectHelper$12.run(AntProjectHelper.java:802)
at org.openide.util.Mutex.readAccess(Mutex.java:195)
at org.netbeans.spi.project.support.ant.AntProjectHelper.getConfigurationFragment(AntProjectHelper.java:796)
at org.netbeans.spi.project.support.ant.AntProjectHelper$11.run(AntProjectHelper.java:712)
at org.openide.util.Mutex.readAccess(Mutex.java:195)
at org.netbeans.spi.project.support.ant.AntProjectHelper.getPrimaryConfigurationData(AntProjectHelper.java:709)
at org.netbeans.modules.java.j2seproject.UpdateHelper$3.run(UpdateHelper.java:135)
at org.openide.util.Mutex.readAccess(Mutex.java:195)
at org.netbeans.modules.java.j2seproject.UpdateHelper.getPrimaryConfigurationData(UpdateHelper.java:132)
at org.netbeans.modules.java.j2seproject.SourceRoots.readProjectMetadata(SourceRoots.java:387)
at org.netbeans.modules.java.j2seproject.SourceRoots.access$200(SourceRoots.java:54)
at org.netbeans.modules.java.j2seproject.SourceRoots$2.run(SourceRoots.java:127)
at org.openide.util.Mutex.readAccess(Mutex.java:195)
at org.netbeans.modules.java.j2seproject.SourceRoots.getRootProperties(SourceRoots.java:123)
at org.netbeans.modules.java.j2seproject.J2SESources.initSources(J2SESources.java:95)
at org.netbeans.modules.java.j2seproject.J2SESources.<init>(J2SESources.java:67)
at org.netbeans.modules.java.j2seproject.J2SEProject.createLookup(J2SEProject.java:132)
at org.netbeans.modules.java.j2seproject.J2SEProject.<init>(J2SEProject.java:92)
at org.netbeans.modules.java.j2seproject.J2SEProjectType.createProject(J2SEProjectType.java:41)
at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.loadProject(AntBasedProjectFactorySingleton.java:165)
at org.netbeans.api.project.ProjectManager.createProject(ProjectManager.java:319)
at org.netbeans.api.project.ProjectManager.access$700(ProjectManager.java:44)
at org.netbeans.api.project.ProjectManager$2.run(ProjectManager.java:233)
at org.openide.util.Mutex.readAccess(Mutex.java:234)
at org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:180)
at org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:68)
at org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:68)
at org.netbeans.modules.i18n.I18nAction.enable(I18nAction.java:92)
at org.openide.util.actions.NodeAction.isEnabled(NodeAction.java:170)
at org.openide.awt.Actions$MenuBridge.updateState(Actions.java:776)
at org.openide.awt.Actions.connect(Actions.java:131)
at org.openide.awt.Actions.connect(Actions.java:116)
at org.openide.awt.Actions$MenuItem.<init>(Actions.java:1094)
at org.netbeans.modules.openide.awt.DefaultAWTBridge.createMenuPresenter(DefaultAWTBridge.java:38)
at org.openide.util.actions.CallableSystemAction.getMenuPresenter(CallableSystemAction.java:55)
at org.netbeans.modules.i18n.I18nGroupAction$LazyPopup.createMenuItems(I18nGroupAction.java:187)
at org.netbeans.modules.i18n.I18nGroupAction$LazyPopup.<init>(I18nGroupAction.java:157)
at org.netbeans.modules.i18n.I18nGroupAction$LazyPopup.createLazyPopup(I18nGroupAction.java:163)
at org.netbeans.modules.i18n.I18nGroupAction.getMenuPresenter(I18nGroupAction.java:101)
at org.openide.actions.ToolsAction.generate(ToolsAction.java:153)
at org.openide.actions.ToolsAction.access$200(ToolsAction.java:47)
at org.openide.actions.ToolsAction$Inline.synchMenuPresenters(ToolsAction.java:217)
at org.openide.awt.DynaMenuModel.checkSubmenu(DynaMenuModel.java:150)
at org.openide.awt.MenuBar$LazyMenu.stateChanged(MenuBar.java:480)
at javax.swing.DefaultButtonModel.fireStateChanged(DefaultButtonModel.java:362)
at javax.swing.DefaultButtonModel.setSelected(DefaultButtonModel.java:228)
at javax.swing.JMenu.setSelected(JMenu.java:280)
at javax.swing.JMenu.menuSelectionChanged(JMenu.java:1251)
at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:83)
at javax.swing.MenuSelectionManager.clearSelectedPath(MenuSelectionManager.java:115)
at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.cancelPopupMenu(BasicPopupMenuUI.java:818)
at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.windowDeactivated(BasicPopupMenuUI.java:844)
at java.awt.AWTEventMulticaster.windowDeactivated(AWTEventMulticaster.java:342)
at java.awt.Window.processWindowEvent(Window.java:1469)
at javax.swing.JFrame.processWindowEvent(JFrame.java:266)
at java.awt.Window.processEvent(Window.java:1412)
at java.awt.Component.dispatchEventImpl(Component.java:4359)
at java.awt.Container.dispatchEventImpl(Container.java:2018)
at java.awt.Window.dispatchEventImpl(Window.java:2066)
at java.awt.Component.dispatchEvent(Component.java:4193)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1826)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:858)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:572)
at java.awt.Component.dispatchEventImpl(Component.java:4231)
at java.awt.Container.dispatchEventImpl(Container.java:2018)
at java.awt.Window.dispatchEventImpl(Window.java:2066)
at java.awt.Component.dispatchEvent(Component.java:4193)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.SentEvent.dispatch(SentEvent.java:55)
at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:177)
at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:204)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:379)
at java.awt.Component.dispatchEventImpl(Component.java:4231)
at java.awt.Container.dispatchEventImpl(Container.java:2018)
at java.awt.Window.dispatchEventImpl(Window.java:2066)
at java.awt.Component.dispatchEvent(Component.java:4193)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.SentEvent.dispatch(SentEvent.java:55)
at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:177)
at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:204)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:280)
at java.awt.Component.dispatchEventImpl(Component.java:4231)
at java.awt.Container.dispatchEventImpl(Container.java:2018)
at java.awt.Window.dispatchEventImpl(Window.java:2066)
at java.awt.Component.dispatchEvent(Component.java:4193)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
[catch] at java.awt.SequencedEvent.dispatch(SequencedEvent.java:98)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:270)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:198)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:171)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:166)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:158)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:119)