https://www.screencast.com/t/mnuvefv4CMO8

code

if (this._signInManager.PasswordSignInAsync(model.UserName.ToLower(), model.Password, false, false).Result.Succeeded)

Exception
The type initializer for 'Microsoft.EntityFrameworkCore.Query.ExpressionTranslators.Internal.SqlServerStringReplaceTranslator' threw an exception.

InnerException

Sequence contains more than one matching element

StackTrace

at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
at Microsoft.EntityFrameworkCore.Query.ExpressionTranslators.Internal.SqlServerStringReplaceTranslator..cctor()