java.lang.AssertionError: Should be a folder: C:\nb\main\nbbuild\netbeans\harness\modules@dfe71616:9f8f43
   at org.netbeans.modules.masterfs.watcher.Watcher$Ext.unregister(Watcher.java:247)
   at org.netbeans.modules.masterfs.watcher.Watcher.unregister(Watcher.java:130)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.removeFileChangeListener(BaseFileObj.java:508)
Caused: java.lang.reflect.InvocationTargetException
   at sun.reflect.GeneratedMethodAccessor104.invoke(GeneratedMethodAccessor104.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:601)
   at org.openide.util.WeakListenerImpl$ListenerReference.run(WeakListenerImpl.java:595)
   at org.openide.util.lookup.implspi.ActiveQueue$Impl.run(ActiveQueue.java:109)
   at java.lang.Thread.run(Thread.java:722)