java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.newEntityResolver(AutoupdateCatalogParser.java:115)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.<init>(AutoupdateCatalogParser.java:84)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:196)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:143)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getDescription(AutoupdateCatalogProvider.java:106)
   at org.netbeans.modules.autoupdate.services.UpdateUnitProviderImpl.getDescription(UpdateUnitProviderImpl.java:113)
   at org.netbeans.api.autoupdate.UpdateUnitProvider.getDescription(UpdateUnitProvider.java:107)
   at org.netbeans.modules.autoupdate.ui.actions.ShowNotifications.getMessage(ShowNotifications.java:89)
   at org.netbeans.modules.autoupdate.ui.actions.ShowNotifications.checkNotification(ShowNotifications.java:76)
   at org.netbeans.modules.autoupdate.ui.Utilities.showProviderNotification(Utilities.java:416)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler$7.run(AutoupdateCheckScheduler.java:490)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:430)
   at org.netbeans.modules.autoupdate.ui.actions.AutoupdateCheckScheduler$5.run(AutoupdateCheckScheduler.java:197)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)