java.lang.NoClassDefFoundError: Could not initialize class org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem
   at org.netbeans.modules.masterfs.filebasedfs.FileBasedURLMapper.getFileObjects(FileBasedURLMapper.java:131)
   at org.netbeans.modules.masterfs.MasterURLMapper.getFileObjects(MasterURLMapper.java:62)
   at org.openide.filesystems.URLMapper.findFileObject(URLMapper.java:213)
   at org.openide.filesystems.FileUtil.toFileObject(FileUtil.java:980)
   at org.netbeans.modules.autoupdate.services.ModuleDeleterImpl.removeModuleFilesInCluster(ModuleDeleterImpl.java:339)
   at org.netbeans.modules.autoupdate.services.ModuleDeleterImpl.removeModuleFiles(ModuleDeleterImpl.java:281)
   at org.netbeans.modules.autoupdate.services.ModuleDeleterImpl.markForDelete(ModuleDeleterImpl.java:165)
   at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForUninstall.doOperation(OperationSupportImpl.java:395)
   at org.netbeans.api.autoupdate.OperationSupport.doOperation(OperationSupport.java:67)
   at org.netbeans.modules.autoupdate.ui.wizards.UninstallStep.handleAction(UninstallStep.java:192)
   at org.netbeans.modules.autoupdate.ui.wizards.UninstallStep.doAction(UninstallStep.java:152)
   at org.netbeans.modules.autoupdate.ui.wizards.UninstallStep.access$000(UninstallStep.java:67)
   at org.netbeans.modules.autoupdate.ui.wizards.UninstallStep$1.propertyChange(UninstallStep.java:126)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at java.awt.Component.firePropertyChange(Component.java:8128)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel.access$000(OperationPanel.java:61)
   at org.netbeans.modules.autoupdate.ui.wizards.OperationPanel$1.run(OperationPanel.java:81)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:641)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1123)