java.util.ConcurrentModificationException
        at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:373)
        at java.util.LinkedHashMap$KeyIterator.next(LinkedHashMap.java:384)
        at org.netbeans.modules.versioning.VersioningManager.getLocalHistory(VersioningManager.java:304)
        at org.netbeans.modules.versioning.FilesystemInterceptor.getInterceptor(FilesystemInterceptor.java:253)
        at org.netbeans.modules.versioning.FilesystemInterceptor.fileDeleted(FilesystemInterceptor.java:164)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:145)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:125)
        at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:102)
        at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1109)
        at org.openide.filesystems.EventControl.invokeDispatchers(EventControl.java:205)
        at org.openide.filesystems.EventControl.exitAtomicAction(EventControl.java:179)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:124)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:539)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObjectFactory.refresh(FileObjectFactory.java:647)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RootObj.invokeRefreshFor(RootObj.java:178)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.RootObj.setAttribute(RootObj.java:130)
        at org.openide.filesystems.FileUtil.refreshFor(FileUtil.java:154)
        at org.openide.filesystems.FileUtil$1.run(FileUtil.java:177)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)