java.lang.ClassNotFoundException: org.netbeans.updater.XMLUtil
   at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
   at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.ClassNotFoundException: org.netbeans.updater.XMLUtil starting from ModuleCL@16e71614[org.netbeans.modules.autoupdate.services] with possible defining loaders null and declared parents [org.netbeans.MainImpl$BootClassLoader@30dae81, ModuleCL@5e115dbf[org.netbeans.api.progress]]
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: org/netbeans/updater/XMLUtil
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.newEntityResolver(AutoupdateCatalogParser.java:115)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.<init>(AutoupdateCatalogParser.java:84)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:196)
   at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogProvider.getUpdateItems(AutoupdateCatalogProvider.java:143)
   at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.appendUpdateItems(UpdateUnitFactory.java:173)
   at org.netbeans.modules.autoupdate.services.UpdateUnitFactory.getUpdateUnits(UpdateUnitFactory.java:143)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl$Cache.<init>(UpdateManagerImpl.java:271)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getCache(UpdateManagerImpl.java:231)
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getUpdateUnits(UpdateManagerImpl.java:100)
   at org.netbeans.api.autoupdate.UpdateManager.getUpdateUnits(UpdateManager.java:103)
   at org.netbeans.modules.moduleresolver.FindBrokenModules.checkBrokenDependencies(FindBrokenModules.java:191)
   at org.netbeans.modules.moduleresolver.FindBrokenModules.access$300(FindBrokenModules.java:68)
   at org.netbeans.modules.moduleresolver.FindBrokenModules$2.run(FindBrokenModules.java:185)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
Caused: org.openide.util.RequestProcessor$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.moduleresolver.FindBrokenModules.scheduleCheckIt(FindBrokenModules.java:84)
   at org.netbeans.modules.moduleresolver.ResolverInstaller.restored(ResolverInstaller.java:60)
   at org.netbeans.core.startup.NbInstaller.loadCode(NbInstaller.java:471)
   at org.netbeans.core.startup.NbInstaller.loadImpl(NbInstaller.java:394)
   at org.netbeans.core.startup.NbInstaller.access$000(NbInstaller.java:105)
   at org.netbeans.core.startup.NbInstaller$1.run(NbInstaller.java:346)
   at org.openide.filesystems.FileUtil$2.run(FileUtil.java:435)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:609)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:419)
   at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:439)
   at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:343)
   at org.netbeans.ModuleManager.enable(ModuleManager.java:1194)
   at org.netbeans.ModuleManager.enable(ModuleManager.java:1017)
   at org.netbeans.core.startup.ModuleList.installNew(ModuleList.java:340)
   at org.netbeans.core.startup.ModuleList.trigger(ModuleList.java:276)
   at org.netbeans.core.startup.ModuleSystem.restore(ModuleSystem.java:301)
   at org.netbeans.core.startup.Main.getModuleSystem(Main.java:181)
   at org.netbeans.core.startup.Main.getModuleSystem(Main.java:150)
   at org.netbeans.core.startup.Main.start(Main.java:307)
   at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:123)
   at java.lang.Thread.run(Thread.java:744)