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EsentFileNotFoundException.FileNotFound exception when initializing RavenDb-Embedded
EmbeddableDocumentStore _documentStore = new EmbeddableDocumentStore()
        {
            DataDirectory = @"C:tempRavenDb"
        };

        using (_documentStore.Initialize())
        {

        }

Microsoft.Isam.Esent.Interop.EsentFileNotFoundException occurred
Message=File not found
Source=Esent.Interop
StackTrace:
    at Microsoft.Isam.Esent.Interop.Api.Check(Int32 err) in C:WorkravendbSharedLibsSourcesmanagedesent-61618EsentInteropApi.cs:line 2736
InnerException:

System.IO.FileNotFoundException occurred
Message=segments.gen
Source=Lucene.Net
StackTrace:
   at Lucene.Net.Store.RAMDirectory.OpenInput(String name) in z:Libslucene.netsrccoreStoreRAMDirectory.cs:line 301
InnerException:

private void RefreshGrid()
    {

        BackgroundWorker bw = new BackgroundWorker();
        bw.DoWork += new DoWorkEventHandler(bw_DoWork);
        bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
        if (bw.IsBusy != true)
        {
            bw.RunWorkerAsync(_domainType);
        }

    }

    void bw_DoWork(object sender, DoWorkEventArgs e)
    {
        e.Result = EventStoreInstance.Instance.GetAggregateRoots((Type)e.Argument);

    }

//Called in class ctor:
        _publisher = publisher;
        _documentStore = new EmbeddableDocumentStore()
        {
            DataDirectory = _dataDir // is "C:tempRavenDb"
        };

    public List<AggregateRootModel> GetAggregateRoots(Type AggregrateRootType)
    {
        using (_documentStore.Initialize())
        {
            using (var session = _documentStore.OpenSession())
            {
                var aggregateRoots = session.Query<AggregateRootModel>()
                    .Where(p => p.Type == AggregrateRootType.AssemblyQualifiedName).ToList();
                return aggregateRoots;
            }
        }
    }