java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.newEntityResolver(AutoupdateCatalogParser.java:126)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.<init>(AutoupdateCatalogParser.java:95)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:187)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:119)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getDescription(AutoupdateCatalogProvider.java:98)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getDescription(UpdateUnitProviderImpl.java:111)
   at org.netbeans.api.autoupdate.UpdateUnitProvider.getDescription(UpdateUnitProvider.java:106)
   at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener.modelOrSelectionChanged(SettingsTab.java:420)
   at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener.access$600(SettingsTab.java:387)
   at org.netbeans.modules.autoupdate.ui.SettingsTab$Listener$1.run(SettingsTab.java:391)
   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: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)