java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil
        at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.newEntityResolver(AutoupdateCatalogParser.java:123)
        at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.<init>(AutoupdateCatalogParser.java:92)
        at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:182)
        at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:118)
        at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getDescription(AutoupdateCatalogProvider.java:94)
        at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getDescription(UpdateUnitProviderImpl.java:108)
        at org.netbeans.api.autoupdate.UpdateUnitProvider.getDescription(UpdateUnitProvider.java:103)
        at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener.modelOrSelectionChanged(SettingsTab.java:417)
        at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener.access$600(SettingsTab.java:384)
        at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener$1.run(SettingsTab.java:388)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
        at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
        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)