The current type, is an interface and cannot be constructed. Are you missing a type mapping?

Question

Why it is not working?

This is my controller.

public class OperatorsController : BaseController
{
    private readonly IOperatorService userService;
    public OperatorsController(IOperatorService userService)
    {
        this.userService = userService;
    }

    public ActionResult Index()
    {
        return View();
    }
}

Answer 1

You should explore the answers to this question. You likely have forgotten to map IOperatorService to a concrete class in your Unity container.