Ansys Error loading container 172
 

I get always get this error while starting certain project:

System.NullReferenceException: Object reference not set to an instance of an object.
at Ansys.Core.DataModel.DataObjects.Persistence.DataO bjectContainerReaderWriter.LoadContainerData(DataO bjectContainer container, IStorageObjectReader persistenceItf, PersistenceContext context)
at Ansys.Core.DataModel.ProjectSystem.DataContainerRe cord.doLoadContainerData(IStorageObjectReader storage, DataContainerReference reference, PersistenceContext context, Int64 profileId)
at Ansys.Core.DataModel.ProjectSystem.DataContainerRe cord.LoadContainerData(IStorageObjectReader storage, DataContainerReference reference, PersistenceContext context, Int64 profileId)
--- Ansys.Core.Persistence.ContainerLoadFailedExceptio n: Object reference not set to an instance of an object.
at Ansys.Core.DataModel.ProjectSystem.DataContainerRe cord.LoadContainerData(IStorageObjectReader storage, DataContainerReference reference, PersistenceContext context, Int64 profileId)
at Ansys.Core.DataModel.ProjectSystem.Project.ReadCon tainerDataFromStorage(IStorageObjectReader storage, String containerName, DataContainerReference reference, Int64 profileId)
at Ansys.Core.DataModel.ProjectSystem.Project.ReloadC ontainer(String containerName, DataContainerReference reference, Int64 profileId)
--- Ansys.Core.Persistence.ContainerLoadFailedExceptio n: Error loading container Setup 172: Object reference not set to an instance of an object.
at Ansys.Core.DataModel.ProjectSystem.Project.ReloadC ontainer(String containerName, DataContainerReference reference, Int64 profileId)
at Ansys.Core.DataModel.ProjectSystem.DataContainerRe cord.getPayload(Int64 calledFromProfileId, IReadOnlySet`1 allowLocksDuringLoad)
at Ansys.Core.DataModel.ProjectSystem.ContainerLockMa nager.Lock(LockType lockType, Boolean useProjectLock, Func`1 getObjectToKeepAliveWhileLocked, IEventPublisher eventManagerToSuspend)
at Ansys.Core.DataModel.ProjectSystem.DataContainerRe cord.Lock(LockType lockType, IEventPublisher eventManager, IProtectedContext commandContext, Int64 profileId, IReadOnlySet`1 allowLocksDuringLoad, Boolean useProjectLock, Boolean succeedIfAlreadyLocked)
at Ansys.Core.Commands.CommandContext.ContainerReadLo ck(DataContainerReference container)
at Ansys.ParameterManager.Data.ContainerDataGroupsCac he.GetContainerDataGroups(DataContainerReference container)
at Ansys.ProjectSchematic.Dependency.SchematicMaps.Ga therData(IQueryContext context, Boolean includeParametricSystems)
at Ansys.ProjectSchematic.Dependency.UpdatableDepende ncies..ctor(IQueryContext context, Boolean includeParametricSystems)
at Ansys.ProjectSchematic.Queries.GetAllDisplayStates Query.Execute(IQueryContext context)
at Ansys.Core.Commands.Concurrency.QueryWorkUnit.exec uteInContext(CommandContext subContext, IExecutionEngineCallback tracer)
at Ansys.Core.Commands.Concurrency.BaseWorkUnit.doExe cute(IExecutionEngineCallback executionEngine, CommandContext subContext)
at Ansys.Core.Commands.Concurrency.BaseWorkUnit.Execu te(IExecutionEngineCallback executionEngine, Boolean dontCatchExceptions)
--- Ansys.Core.Commands.CommandFailedException: Error loading container Setup 172: Object reference not set to an instance of an object.
CommandName: GetAllDisplayStates()
at Ansys.Core.Commands.CommandAsyncResult.RethrowFail ureException(Exception e)
at Ansys.Core.Commands.CommandAsyncResult.Wait(Int32 milliSecondsTimeout, Boolean exitContext)
at Ansys.ProjectSchematic.Queries.GetAllDisplayStates Query.InvokeAndWait(IQueryContext context)
at Ansys.ProjectSchematic.View.ProjectSchematicViewCe llStateEngine.UpdateStates(Boolean setStates)

It seems I can't do anything with my project right now. Any ideas how to solve this error?