java.lang.AssertionError: getParent should not return null for /
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.getParent(BaseFileObj.java:459)
   at org.netbeans.core.ui.warmup.MenuWarmUpTask$NbWindowsAdapter$1.setSource(MenuWarmUpTask.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RefreshSlow.progress(RefreshSlow.java:61)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:496)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refreshAll(FileObjectFactory.java:427)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory$1.run(FileObjectFactory.java:668)
   at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.runAsInconsistent(FileBasedFileSystem.java:102)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory$2.run(FileObjectFactory.java:676)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:122)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:539)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:674)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RootObj.invokeRefreshFor(RootObj.java:183)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RefreshSlow.run(RefreshSlow.java:56)
   at org.netbeans.core.ui.warmup.MenuWarmUpTask$NbWindowsAdapter.run(MenuWarmUpTask.java:224)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1367)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1905)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: getParent should not return null for /
   at org.openide.util.RequestProcessor$Task.schedule(RequestProcessor.java:1405)
   at org.netbeans.core.ui.warmup.MenuWarmUpTask$NbWindowsAdapter.windowActivated(MenuWarmUpTask.java:151)
   at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:373)
   at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:372)
   at java.awt.AWTEventMulticaster.windowActivated(AWTEventMulticaster.java:372)
   at java.awt.Window.processWindowEvent(Window.java:1877)
   at javax.swing.JFrame.processWindowEvent(JFrame.java:274)
   at java.awt.Window.processEvent(Window.java:1823)
   at java.awt.Component.dispatchEventImpl(Component.java:4630)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:910)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:409)
   at java.awt.Component.dispatchEventImpl(Component.java:4502)
   at java.awt.Container.dispatchEventImpl(Container.java:2099)
   at java.awt.Window.dispatchEventImpl(Window.java:2478)
   at java.awt.Component.dispatchEvent(Component.java:4460)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   at java.awt.SentEvent.dispatch(SentEvent.java:55)
   at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:183)
   at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:210)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:286)
   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:133)
   at java.awt.SequencedEvent.dispatch(SequencedEvent.java:101)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:133)
   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)