System.NullReferenceException: Object reference not set to an instance of an object.
at MyApp.Services.UserService.GetUserById(Guid userId) in C:\Projects\MyApp\Services\UserService.cs:line 45
at MyApp.Controllers.UserController.GetUser(Guid id) in C:\Projects\MyApp\Controllers\UserController.cs:line 27
at lambda_method(Closure , Object , Object[] )
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.Execute(...)