"This file's format is not supported or you don't specify a correct format." When creating multiple files using Aspose.Cells

I am trying to create multiple workbooks in multi threading environment using MemoryStream, But, I am getting below error.

“This file’s format is not supported or you don’t specify a correct format.”
Below is my code :

      try
        {
            lock (locker)
            {
                memoryStream.Seek(0, SeekOrigin.Begin);
                _workBook = new Workbook(memoryStream);
                //clear default worksheet
                if (memoryStream.Length < 1)
                {
                    _workBook.Worksheets.Clear();
                }
                memoryStream.Close();
                memoryStream.Dispose();
            }
        }catch(Exception ex)
        {
        }

Screenshot (24).png (26.2 KB)

@sachingangarde,
Please share your sample file if single file is used in testing or send us all files which are used, for our testing. We will reproduce the problem and provide our feedback after analysis.