New Post: 'No such file' exception when calling DownloadFile (SftpClient) asyncronously

here is a code sample i use:
class Processor : IDisposable
{

    private class StateData
    {
        public Processor Processor { get; set; }
        public FileStream FileStream { get; set; }
        public string FileName { get; set; }
    }

private SftpClient m_sftpClient;
private string m_strTestBase = @"/Home/aaa/bbb";
private AsyncCallback m_asyncCallback = new AsyncCallback(CompleteDownload);

internal void Process()
{
....
m_sftpClient = new SftpClient("xxx", "yyy", "zzz");
m_sftpClient.Connect();
ProcessDirectory(m_strTestBase);
....
}

private static void CompleteDownload(IAsyncResult result)

    {
        SftpDownloadAsyncResult sftpDownloadAsyncResult = (SftpDownloadAsyncResult)result;

        StateData stateData = (StateData)result.AsyncState;
        Processor proc = stateData.Processor;

        try
        {
            proc.m_sftpClient.EndDownloadFile(result);
            Interlocked.Increment(ref proc.m_iDownloadedCnt);

            // Write Console Output
            Console.WriteLine("Success: " + stateData.FileName);
        }
        catch(Exception ex)
        {
            Interlocked.Increment(ref proc.m_iFailedCnt);
            Console.WriteLine("Exception in 'CompleteDownload' [" + stateData.FileName  + "]: " + ex.Message);
        }
        finally
        {
            try
            {
                stateData.FileStream.Flush();
                stateData.FileStream.Dispose();
            }
            catch
            {
            }

            if (Interlocked.Decrement(ref s_iRequestCounter) == 0)
            {
                proc.m_iEndProcessingEvent.Set();
            }

        }
    }

    private void ProcessFile(string strFile)
    {
        string str1 = strFile.Substring(m_strTestBase.Length + 1).Replace('/', '\\');
        string strOutFileNameLong = Path.Combine(m_strTestOutputDataDir, str1);
        if (!File.Exists(strOutFileNameLong))
        {
            string strOutDir = Path.GetDirectoryName(strOutFileNameLong);
            if (!Directory.Exists(strOutDir))
            {
                Directory.CreateDirectory(strOutDir);
            }

            FileStream fs = File.Create(strOutFileNameLong, 4096, FileOptions.Asynchronous);
            StateData stateData = new StateData { Processor = this, FileName = strOutFileNameLong, FileStream = fs };

            Console.WriteLine("S: " + strFile + "   ---   D: " + strOutFileNameLong);


            Interlocked.Increment(ref s_iRequestCounter);
            m_sftpClient.BeginDownloadFile(strFile, fs, m_asyncCallback, stateData);
        }
        else
        {
            m_iSkippedCnt++;
        }

    }

    private void ProcessDirectory(string strDirectory)
    {
        var vFiles = m_sftpClient.ListDirectory(strDirectory);
        foreach (var vFile in vFiles)
        {
            if (vFile.IsDirectory)
            {
                ProcessDirectory(vFile.FullName);
            }
            else if (vFile.IsRegularFile)
            {
                ProcessFile(vFile.FullName);
            }
        }
    }