System.AggregateException: 'Some services are not able to be constructed' 
InvalidOperationException: Error while validating the service descriptor 'ServiceType: Blog.Core.Services.Interfaces.IUserService Lifetime: Transient ImplementationType: Blog.Core.Services.UserService': Unable to resolve service for type 'Microsoft.AspNetCore.Mvc.Razor.IRazorViewEngine' while attempting to activate 'Blog.Core.Convertors.ViewRendererService'. 
InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Mvc.Razor.IRazorViewEngine' while attempting to activate 'Blog.Core.Convertors.ViewRendererService'.