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.fileDataCreated(FilesystemInterceptor.java:208)
        at org.netbeans.modules.versioning.FilesystemInterceptor.fileFolderCreated(FilesystemInterceptor.java:192)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:139)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:125)
        at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:102)
        at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1109)
        at org.openide.filesystems.EventControl.invokeDispatchers(EventControl.java:205)
        at org.openide.filesystems.EventControl.exitAtomicAction(EventControl.java:179)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:124)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:539)
        at org.netbeans.modules.parsing.impl.indexing.CacheFolder.getDataFolder(CacheFolder.java:140)
        at org.netbeans.modules.parsing.impl.indexing.CacheFolder.getDataFolder(CacheFolder.java:132)
        at org.netbeans.modules.parsing.impl.indexing.TimeStamps.load(TimeStamps.java:81)
        at org.netbeans.modules.parsing.impl.indexing.TimeStamps.<init>(TimeStamps.java:76)
        at org.netbeans.modules.parsing.impl.indexing.TimeStamps.forRoot(TimeStamps.java:170)
        at org.netbeans.modules.parsing.impl.indexing.Crawler.<init>(Crawler.java:69)
        at org.netbeans.modules.parsing.impl.indexing.FileObjectCrawler.<init>(FileObjectCrawler.java:72)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSource(RepositoryUpdater.java:2763)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$AbstractRootsWork.scanSources(RepositoryUpdater.java:2684)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$RootsWork.getDone(RepositoryUpdater.java:2518)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:1772)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:3133)
        at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:3075)
        at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:574)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)