java.lang.NullPointerException
   at org.netbeans.modules.masterfs.filebasedfs.naming.NameRef.getIndex(NameRef.java:64)
   at org.netbeans.modules.masterfs.filebasedfs.naming.NamingFactory.cleanQueue(NamingFactory.java:313)
   at org.netbeans.modules.masterfs.filebasedfs.naming.NamingFactory.registerInstanceOfFileNaming(NamingFactory.java:179)
   at org.netbeans.modules.masterfs.filebasedfs.naming.NamingFactory.fromFile(NamingFactory.java:91)
   at org.netbeans.modules.masterfs.filebasedfs.children.ChildrenSupport.rescanChild(ChildrenSupport.java:189)
   at org.netbeans.modules.masterfs.filebasedfs.children.ChildrenSupport.getChild(ChildrenSupport.java:110)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj$FolderChildrenCache.getChild(FolderObj.java:611)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getFileObject(FileObjectFactory.java:186)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getValidFileObject(FileObjectFactory.java:697)
   at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.getFileObject(FileBasedFileSystem.java:137)
   at org.netbeans.modules.masterfs.filebasedfs.FileBasedURLMapper.getFileObjects(FileBasedURLMapper.java:134)
   at org.netbeans.modules.masterfs.MasterURLMapper.getFileObjects(MasterURLMapper.java:65)
   at org.openide.filesystems.URLMapper.findFileObject(URLMapper.java:216)
   at org.netbeans.modules.project.ui.actions.RecentProjects.fillSubMenu(RecentProjects.java:154)
   at org.netbeans.modules.project.ui.actions.RecentProjects.access$300(RecentProjects.java:82)
   at org.netbeans.modules.project.ui.actions.RecentProjects$UpdatingMenu.stateChanged(RecentProjects.java:256)
   at javax.swing.DefaultButtonModel.fireStateChanged(DefaultButtonModel.java:333)
   at javax.swing.DefaultButtonModel.setSelected(DefaultButtonModel.java:215)
   at javax.swing.JMenu.setSelected(JMenu.java:294)
   at javax.swing.JMenu.menuSelectionChanged(JMenu.java:1175)
   at javax.swing.MenuSelectionManager.setSelectedPath(MenuSelectionManager.java:100)
   at javax.swing.plaf.basic.BasicMenuUI$Handler.mouseEntered(BasicMenuUI.java:491)
   at java.awt.Component.processMouseEvent(Component.java:6276)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
   at java.awt.Component.processEvent(Component.java:6032)
   at java.awt.Container.processEvent(Container.java:2041)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4577)
   at java.awt.LightweightDispatcher.trackMouseEnterExit(LightweightDispatcher.java:4366)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4220)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4168)
   at java.awt.Container.dispatchEventImpl(Container.java:2085)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
   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)