java.lang.AssertionError
   at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:602)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:108)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:146)
   at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:438)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:647)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:638)
   at org.openide.util.Mutex.writeAccess(Mutex.java:436)
   at org.netbeans.api.project.ProjectManager.saveProject(ProjectManager.java:638)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.ConfigurationProjectXMLWriter(MakeConfigurationDescriptor.java:839)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.saveWorker(MakeConfigurationDescriptor.java:741)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.access$100(MakeConfigurationDescriptor.java:105)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor$SaveRunnable.run(MakeConfigurationDescriptor.java:667)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1426)
   at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:2012)
   at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:1661)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.save(MakeConfigurationDescriptor.java:628)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.save(MakeConfigurationDescriptor.java:621)
   at org.netbeans.modules.cnd.makeproject.MakeSharabilityQuery.getSharability(MakeSharabilityQuery.java:101)
   at org.netbeans.modules.projectapi.ProjectSharabilityQuery.getSharability(ProjectSharabilityQuery.java:67)
   at org.netbeans.api.queries.SharabilityQuery.getSharability(SharabilityQuery.java:113)
   at org.netbeans.modules.mercurial.util.HgUtils.isIgnored(HgUtils.java:448)
   at org.netbeans.modules.mercurial.FileStatusCache$1.run(FileStatusCache.java:118)
   at org.netbeans.modules.mercurial.FileStatusCache.handleIgnoredFiles(FileStatusCache.java:137)
   at org.netbeans.modules.mercurial.FileStatusCache.checkForIgnoredFile(FileStatusCache.java:153)
   at org.netbeans.modules.mercurial.FileStatusCache.getCachedStatus(FileStatusCache.java:295)
   at org.netbeans.modules.mercurial.FileStatusCache.getCachedStatus(FileStatusCache.java:276)
   at org.netbeans.modules.mercurial.MercurialInterceptor.beforeCreate(MercurialInterceptor.java:273)
   at org.netbeans.modules.versioning.FilesystemInterceptor$DelegatingInterceptor.beforeCreate(FilesystemInterceptor.java:540)
   at org.netbeans.modules.versioning.FilesystemInterceptor.beforeCreate(FilesystemInterceptor.java:245)
   at org.netbeans.modules.masterfs.ProvidedExtensionsProxy$2.run(ProvidedExtensionsProxy.java:150)
   at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.runCheckCode(ProvidedExtensionsProxy.java:458)
   at org.netbeans.modules.masterfs.ProvidedExtensionsProxy.beforeCreate(ProvidedExtensionsProxy.java:148)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.createData(FolderObj.java:297)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.createDataImpl(FolderObj.java:262)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj$1.call(FolderObj.java:232)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj$1.call(FolderObj.java:230)
   at org.netbeans.modules.masterfs.filebasedfs.FileBasedFileSystem.runAsInconsistent(FileBasedFileSystem.java:115)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FolderObj.createData(FolderObj.java:235)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:925)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$2.run(AntProjectHelper.java:347)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:125)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:566)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.runSaveAA(AntProjectHelper.java:325)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.saveXml(AntProjectHelper.java:341)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.save(AntProjectHelper.java:618)
   at org.netbeans.spi.project.support.ant.AntProjectHelper.access$100(AntProjectHelper.java:108)
   at org.netbeans.spi.project.support.ant.AntProjectHelper$1.save(AntProjectHelper.java:146)
   at org.netbeans.modules.project.ant.AntBasedProjectFactorySingleton.saveProject(AntBasedProjectFactorySingleton.java:438)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:647)
   at org.netbeans.api.project.ProjectManager$6.run(ProjectManager.java:638)
   at org.openide.util.Mutex.writeAccess(Mutex.java:436)
   at org.netbeans.api.project.ProjectManager.saveProject(ProjectManager.java:638)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.ConfigurationProjectXMLWriter(MakeConfigurationDescriptor.java:839)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.saveWorker(MakeConfigurationDescriptor.java:741)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.access$100(MakeConfigurationDescriptor.java:105)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor$SaveRunnable.run(MakeConfigurationDescriptor.java:667)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:421)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.save(MakeConfigurationDescriptor.java:627)
   at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.save(MakeConfigurationDescriptor.java:621)
   at org.netbeans.modules.cnd.makeproject.MakeSharabilityQuery.getSharability(MakeSharabilityQuery.java:101)
   at org.netbeans.modules.projectapi.ProjectSharabilityQuery.getSharability(ProjectSharabilityQuery.java:67)
   at org.netbeans.api.queries.SharabilityQuery.getSharability(SharabilityQuery.java:113)
   at org.netbeans.modules.mercurial.util.HgUtils.isIgnored(HgUtils.java:448)
   at org.netbeans.modules.mercurial.FileStatusCache$1.run(FileStatusCache.java:118)
   at org.netbeans.modules.mercurial.FileStatusCache.handleIgnoredFiles(FileStatusCache.java:137)
   at org.netbeans.modules.mercurial.FileStatusCache.checkForIgnoredFile(FileStatusCache.java:153)
   at org.netbeans.modules.mercurial.FileStatusCache.getCachedStatus(FileStatusCache.java:295)
   at org.netbeans.modules.mercurial.FileStatusCache.getCachedStatus(FileStatusCache.java:276)
   at org.netbeans.modules.mercurial.FileStatusCache.refreshFileStatus(FileStatusCache.java:509)
   at org.netbeans.modules.mercurial.FileStatusCache.refreshAllRoots(FileStatusCache.java:395)
   at org.netbeans.modules.mercurial.FileStatusCache.refreshAllRoots(FileStatusCache.java:465)
   at org.netbeans.modules.mercurial.MercurialInterceptor$RefreshTask.run(MercurialInterceptor.java:407)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1426)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)