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.registerInstanceOfFileNaming(NamingFactory.java:143)
   at org.netbeans.modules.masterfs.filebasedfs.naming.NamingFactory.fromFile(NamingFactory.java:80)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.create(FileObjectFactory.java:417)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getOrCreate(FileObjectFactory.java:400)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.issueIfExist(FileObjectFactory.java:372)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.getFileObject(FileObjectFactory.java:195)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.getParent(BaseFileObj.java:520)
   at org.netbeans.modules.projectapi.SimpleFileOwnerQueryImplementation.getOwner(SimpleFileOwnerQueryImplementation.java:190)
   at org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:104)
   at org.netbeans.modules.project.ui.Hacks$1.run(Hacks.java:110)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.NullPointerException
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1465)
   at org.netbeans.modules.project.ui.Hacks$3.propertyChange(Hacks.java:158)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
   at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
   at org.netbeans.core.windows.RegistryImpl.tryFireChanges(RegistryImpl.java:304)
   at org.netbeans.core.windows.RegistryImpl.selectedNodesChanged(RegistryImpl.java:239)
   at org.netbeans.core.windows.RegistryImpl.topComponentActivated(RegistryImpl.java:177)
   at org.netbeans.core.windows.WindowManagerImpl.notifyRegistryTopComponentActivated(WindowManagerImpl.java:992)
   at org.netbeans.core.windows.Central.activateModeTopComponent(Central.java:1778)
   at org.netbeans.core.windows.WindowManagerImpl.topComponentRequestActive(WindowManagerImpl.java:1148)
   at org.openide.windows.TopComponent.requestActive(TopComponent.java:871)
   at org.netbeans.core.windows.actions.RecentViewListAction$ActivatableTC.activate(RecentViewListAction.java:170)
   at org.netbeans.swing.popupswitcher.SwitcherTableItem.activate(SwitcherTableItem.java:113)
   at org.netbeans.core.windows.view.ui.KeyboardPopupSwitcher.performSwitching(KeyboardPopupSwitcher.java:418)
   at org.netbeans.core.windows.view.ui.KeyboardPopupSwitcher.processKeyEvent(KeyboardPopupSwitcher.java:385)
   at org.netbeans.core.windows.view.ui.KeyboardPopupSwitcher.processShortcut(KeyboardPopupSwitcher.java:157)
   at org.netbeans.core.windows.ShortcutAndMenuKeyEventProcessor.dispatchKeyEvent(ShortcutAndMenuKeyEventProcessor.java:274)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:983)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676)
   at java.awt.Component.dispatchEventImpl(Component.java:4502)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   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)