Entity Framework Core

Подключаю базу данных с помощью Entity Framework Core. После команды и билдинга всё успешно:

PM>Add-migration Initial
Both Entity Framework Core and Entity Framework 6 are installed. The Entity Framework Core tools are running. Use 'EntityFramework6\Add-Migration' for Entity Framework 6.
Build started...
Build succeeded.

А потом выдает ошибку:

An error occurred while accessing the Microsoft.Extensions.Hosting services. Continuing without the application service provider. Error: The configuration file 'dbsettings.json' was not found and is not optional. The physical path is 'C:\Users\nasbl\source\repos\MirUvlecheniy\MirUvlecheniy\dbsettings.json'.
Unable to create an object of type 'AppDBContent'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728

Подскажите, в чем может быть проблема