This is target controller and action:
[RoutePrefix(\"Editor\")] public class EditorController : Controller [HttpGet] [Route(\"{id:int}\")] public A
Have you checked if you have enabled MVC AttributeRoutes?
routes.MapMvcAttributeRoutes();
see http://blogs.msdn.com/b/webdev/archive/2013/10/17/attribute-routing-in-asp-net-mvc-5.aspx