Request ID: 00-843b5f30bcf2ed77c8c110c65a42d460-0ccbd0e4af639f60-00
A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913.