java.lang.AssertionError: Read null FileSystem from code model persistence for fileSystemIndexInLayer == 2
   at org.netbeans.modules.cnd.repository.storage.Storage$FSReadConverterImpl.layerToClient(Storage.java:1070)
   at org.netbeans.modules.cnd.repository.storage.data.RepositoryDataInputStream.readFileSystem(RepositoryDataInputStream.java:131)
   at org.netbeans.modules.cnd.apt.support.api.StartEntry.<init>(StartEntry.java:101)
   at org.netbeans.modules.cnd.apt.impl.support.clank.ClankIncludeHandlerImpl$StateImpl.<init>(ClankIncludeHandlerImpl.java:345)
   at org.netbeans.modules.cnd.apt.utils.APTSerializeUtils.readIncludeState(APTSerializeUtils.java:258)
   at org.netbeans.modules.cnd.apt.impl.support.APTPreprocHandlerImpl$StateImpl.<init>(APTPreprocHandlerImpl.java:411)
   at org.netbeans.modules.cnd.apt.utils.APTSerializeUtils.readPreprocState(APTSerializeUtils.java:280)
   at org.netbeans.modules.cnd.modelimpl.repository.PersistentUtils.readPreprocState(PersistentUtils.java:770)
   at org.netbeans.modules.cnd.modelimpl.content.project.FileContainer$FileEntry.readStatePair(FileContainer.java:680)
   at org.netbeans.modules.cnd.modelimpl.content.project.FileContainer$FileEntry.<init>(FileContainer.java:622)
   at org.netbeans.modules.cnd.modelimpl.content.project.FileContainer$FileEntry.<init>(FileContainer.java:596)
   at org.netbeans.modules.cnd.modelimpl.content.project.FileContainer.readFilePathsForFileSystemToFileEntryMap(FileContainer.java:496)
   at org.netbeans.modules.cnd.modelimpl.content.project.FileContainer.<init>(FileContainer.java:143)
   at org.netbeans.modules.cnd.modelimpl.csm.core.CsmObjectFactory.createObject(CsmObjectFactory.java:339)
   at org.netbeans.modules.cnd.repository.support.AbstractObjectFactory.readSelfPersistent(AbstractObjectFactory.java:78)
   at org.netbeans.modules.cnd.modelimpl.csm.core.CsmObjectFactory.read(CsmObjectFactory.java:615)
   at org.netbeans.modules.cnd.repository.RepositoryImpl.get(RepositoryImpl.java:119)
   at org.netbeans.modules.cnd.repository.api.Repository.get(Repository.java:27)
   at org.netbeans.modules.cnd.modelimpl.repository.RepositoryUtils.get(RepositoryUtils.java:123)
   at org.netbeans.modules.cnd.modelimpl.cache.impl.WeakContainer.getContainer(WeakContainer.java:94)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ProjectBase.getFileContainer(ProjectBase.java:3765)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ProjectBase.checkConsistency(ProjectBase.java:246)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ProjectBase.readInstance(ProjectBase.java:391)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibProjectImpl.readLibraryInstance(LibProjectImpl.java:82)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibProjectImpl.createInstance(LibProjectImpl.java:99)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibraryManager$LibraryEntry.createUID(LibraryManager.java:631)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibraryManager$LibraryEntry.getLibrary(LibraryManager.java:622)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibraryManager$LibraryEntry.access$200(LibraryManager.java:597)
   at org.netbeans.modules.cnd.modelimpl.csm.core.LibraryManager$1.run(LibraryManager.java:436)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ModelImpl$3.run(ModelImpl.java:440)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)