not able to create db

An error occurred while accessing the Microsoft.Extensions.Hosting services. Continuing without the application service provider. Error: Failed to load configuration from file 'C:\Users\SHIVRAJ\source\repos\CRUDEF\appsettings.json'.
Unable to create a 'DbContext' of type ''. The exception 'Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions`1[CRUDEF.SchoolContext]' while attempting to activate 'CRUDEF.SchoolContext'.' was thrown while attempting to create an instance. For the different patterns supported at design time, see