java.lang.AssertionError: If valid, it should be a folder: /tmp/vcs-1338967773202/vcs-1338971794170@32b2a085:23cba6ec
   at org.netbeans.modules.masterfs.watcher.Watcher$Ext.unregister(Watcher.java:248)
   at org.netbeans.modules.masterfs.watcher.Watcher.unregister(Watcher.java:127)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.removeFileChangeListener(BaseFileObj.java:519)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:0)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.openide.util.WeakListenerImpl$ListenerReference.run(WeakListenerImpl.java:591)
   at org.openide.util.lookup.implspi.ActiveQueue$Daemon.run(ActiveQueue.java:185)