java.lang.AssertionError: Cannot write data for key LayerKey unitId=4 delegate=org.netbeans.modules.cnd.modelimpl.repository.FileDeclarationsKey
   at org.netbeans.modules.cnd.repository.disk.IndexedStorageFile.write(IndexedStorageFile.java:165)
   at org.netbeans.modules.cnd.repository.disk.DoubleFileStorage.write(DoubleFileStorage.java:214)
   at org.netbeans.modules.cnd.repository.disk.FilesAccessStrategyImpl.write(FilesAccessStrategyImpl.java:304)
   at org.netbeans.modules.cnd.repository.storage.data.RepositoryDataOutputStream.commit(RepositoryDataOutputStream.java:93)
   at org.netbeans.modules.cnd.repository.AsyncRepositoryWriterImpl$Worker.doWrite(AsyncRepositoryWriterImpl.java:328)
   at org.netbeans.modules.cnd.repository.AsyncRepositoryWriterImpl$Worker.run(AsyncRepositoryWriterImpl.java:295)
   at org.openide.util.RequestProcessor$FixedRateTask.run(RequestProcessor.java:1187)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: Cannot write data for key LayerKey unitId=4 delegate=org.netbeans.modules.cnd.modelimpl.repository.FileDeclarationsKey
   at org.openide.util.RequestProcessor.scheduleAtFixedRate(RequestProcessor.java:1002)
   at org.netbeans.modules.cnd.repository.AsyncRepositoryWriterImpl.<init>(AsyncRepositoryWriterImpl.java:86)
   at org.netbeans.modules.cnd.repository.RepositoryImpl.<init>(RepositoryImpl.java:91)
   at org.netbeans.modules.cnd.repository.RepositoryImplFactory.createRepository(RepositoryImplFactory.java:57)
   at org.netbeans.modules.cnd.repository.api.Repository.startup(Repository.java:76)
   at org.netbeans.modules.cnd.modelimpl.repository.RepositoryUtils.startup(RepositoryUtils.java:260)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ModelImpl.startup(ModelImpl.java:523)
   at org.netbeans.modules.cnd.modelimpl.csm.core.ModelImpl.<init>(ModelImpl.java:100)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeConstructorAccessorImpl.java:0)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
   at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
   at java.lang.Class.newInstance(Class.java:374)
   at org.openide.util.lookup.implspi.SharedClassObjectBridge.newInstance(SharedClassObjectBridge.java:64)
   at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:509)
   at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:422)
   at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:222)
   at org.netbeans.modules.cnd.api.model.CsmModelAccessor.getModel(CsmModelAccessor.java:152)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport.addProject(ModelSupport.java:396)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport.openProjectsIfNeeded(ModelSupport.java:269)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport.access$000(ModelSupport.java:103)
   at org.netbeans.modules.cnd.modelimpl.platform.ModelSupport$1.run(ModelSupport.java:118)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)