cannot create project netbeans 6.*

Question

I have this error creating a new project on netbeans 6.10M (on 25% of project creation), on other versions, the creation of a new project just fails.. some other functionalities of netbeans are also not working.. im using Snow Leopard, last version

java.lang.NoSuchMethodError: org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar([Lorg/apache/xerces/xni/parser/XMLInputSource;)V
 at org.apache.xerces.jaxp.validation.XMLSchemaFactory.newSchema(Unknown Source)
 at org.netbeans.modules.project.ant.ProjectXMLCatalogReader.projectXmlCombinedSchema(ProjectXMLCatalogReader.java:189)
 at org.netbeans.modules.project.ant.ProjectXMLCatalogReader.validate(ProjectXMLCatalogReader.java:154)
 at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.loadProjectXml(AntBasedProjectFactorySingleton.java:384)
 at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.loadProject(AntBasedProjectFactorySingleton.java:237)
 at org.netbeans.api.project.ProjectManager.createProject(ProjectManager.java:361)
 at org.netbeans.api.project.ProjectManager.access$300(ProjectManager.java:85)
 at org.netbeans.api.project.ProjectManager$2.run(ProjectManager.java:282)
 at org.netbeans.api.project.ProjectManager$2.run(ProjectManager.java:233)
 at org.openide.util.Mutex.readAccess(Mutex.java:330)
 at org.netbeans.api.project.ProjectManager.findProject(ProjectManager.java:233)
 at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:190)
 at org.netbeans.spi.project.support.ant.ProjectGenerator$1.run(ProjectGenerator.java:120)
 at org.openide.util.Mutex.writeAccess(Mutex.java:436)
 at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject0(ProjectGenerator.java:120)
 at org.netbeans.spi.project.support.ant.ProjectGenerator.createProject(ProjectGenerator.java:114)
 at org.netbeans.modules.java.j2seproject.J2SEProjectGenerator.createProject(J2SEProjectGenerator.java:235)
 at org.netbeans.modules.java.j2seproject.J2SEProjectGenerator.access$000(J2SEProjectGenerator.java:87)
 at org.netbeans.modules.java.j2seproject.J2SEProjectGenerator$1.run(J2SEProjectGenerator.java:108)
 at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:125)
 at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:566)
 at org.netbeans.modules.java.j2seproject.J2SEProjectGenerator.createProject(J2SEProjectGenerator.java:106)
 at org.netbeans.modules.java.j2seproject.ui.wizards.NewJ2SEProjectWizardIterator.instantiate(NewJ2SEProjectWizardIterator.java:185)
 at org.openide.loaders.TemplateWizard$InstantiatingIteratorBridge.instantiate(TemplateWizard.java:1019)
 at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:591)
 at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:412)
 at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:256)
 at org.openide.loaders.TemplateWizardIteratorWrapper.instantiate(TemplateWizardIteratorWrapper.java:168)
 at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1541)
 at org.openide.WizardDescriptor.callInstantiate(WizardDescriptor.java:1498)
 at org.openide.WizardDescriptor.access$1700(WizardDescriptor.java:130)
 at org.openide.WizardDescriptor$Listener$2$1.run(WizardDescriptor.java:2069)
 at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1426)
 at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to
 at org.openide.util.RequestProcessor.post(RequestProcessor.java:421)
 at org.openide.WizardDescriptor$Listener$2.run(WizardDescriptor.java:2115)
 at org.openide.WizardDescriptor$8.run(WizardDescriptor.java:1430)
 at org.openide.WizardDescriptor.lazyValidate(WizardDescriptor.java:1470)
 at org.openide.WizardDescriptor.access$1300(WizardDescriptor.java:130)
 at org.openide.WizardDescriptor$Listener.actionPerformed(WizardDescriptor.java:2125)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:459)
 at $Proxy14.actionPerformed(Unknown Source)
 at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028)
 at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351)
 at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
 at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
 at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
 at java.awt.Component.processMouseEvent(Component.java:6348)
 at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
 at java.awt.Component.processEvent(Component.java:6113)
 at java.awt.Container.processEvent(Container.java:2085)
 at java.awt.Component.dispatchEventImpl(Component.java:4714)
 at java.awt.Container.dispatchEventImpl(Container.java:2143)
 at java.awt.Component.dispatchEvent(Component.java:4544)
 at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4618)
 at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4282)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4212)
 at java.awt.Container.dispatchEventImpl(Container.java:2129)
 at java.awt.Window.dispatchEventImpl(Window.java:2478)
 at java.awt.Component.dispatchEvent(Component.java:4544)
[catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:635)
 at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:205)
 at java.awt.Dialog$1.run(Dialog.java:1046)
 at java.awt.Dialog$3.run(Dialog.java:1098)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.awt.Dialog.show(Dialog.java:1096)
 at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1006)
 at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1040)
 at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1028)
 at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:121)
 at org.openide.util.Mutex.doEventAccess(Mutex.java:1361)
 at org.openide.util.Mutex.readAccess(Mutex.java:271)
 at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1013)
 at java.awt.Component.show(Component.java:1563)
 at java.awt.Component.setVisible(Component.java:1515)
 at java.awt.Window.setVisible(Window.java:842)
 at java.awt.Dialog.setVisible(Dialog.java:986)
 at org.openide.loaders.TemplateWizard.instantiateImpl(TemplateWizard.java:498)
 at org.openide.loaders.TemplateWizard.instantiate(TemplateWizard.java:365)
 at org.netbeans.modules.project.ui.actions.NewProject$2.run(NewProject.java:139)
 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:633)
 at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:137)
 at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296)
 at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211)
 at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Answer 1

NetBeans 6.9 works nicely here on 10.6.

I would uninstall everything related to Netbeans (throw the installed folders in the Trash and empty it), and then install just 6.9 again.