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:285)
        at org.netbeans.modules.versioning.FilesystemInterceptor.getAttribute(FilesystemInterceptor.java:117)
        at org.netbeans.modules.masterfs.ProvidedExtensionsProxy$11.run(ProvidedExtensionsProxy.java:261)
        at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.runCheckCode(ProvidedExtensionsProxy.java:282)
        at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.getAttribute(ProvidedExtensionsProxy.java:259)
        at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.getAttribute(BaseFileObj.java:361)
        at org.netbeans.modules.hudson.kenai.KenaiHudsonBuildAssociation.findAssociation(KenaiHudsonBuildAssociation.java:59)
        at org.netbeans.modules.hudson.spi.ProjectHudsonProvider$1.findAssociation(ProjectHudsonProvider.java:69)
        at org.netbeans.modules.hudson.impl.HudsonManagerImpl.checkOpenProjects(HudsonManagerImpl.java:262)
        at org.netbeans.modules.hudson.impl.HudsonManagerImpl.access$000(HudsonManagerImpl.java:71)
        at org.netbeans.modules.hudson.impl.HudsonManagerImpl$1$1.run(HudsonManagerImpl.java:87)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.util.ConcurrentModificationException