All ASP.NET Web API controllers return 404

I'm trying to get an API Controller to work inside an ASP.NET MVC 4 web app. However, every request results in a 404 and I'm stumped. :/ I have the standard API controller route from the project template defined like: ``` public static class WebApiConfig { public static void Register(HttpConfiguration config) { config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); } } ``` The registration is invoked in Global.asax: ``` protected void Application_Start() { AreaRegistration.RegisterAllAreas(); // Register API routes WebApiConfig.Register(GlobalConfiguration.Configuration); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); } ``` I have a basic API controller like this: ``` namespace Website.Controllers { public class FavoritesController : ApiController { // GET api/<controller> public IEnumerable<string> Get() { return new [] { "first", "second" }; } // PUT api/<controller>/5 public void Put(int id) { } // DELETE api/<controller>/5 public void Delete(int id) { } } } ``` Now, when I browse to localhost:59900/api/Favorites I expect the Get method to be invoked, but instead I get a 404 status code and the following response: ``` <Error> <Message> No HTTP resource was found that matches the request URI 'http://localhost:59900/api/Favorites'. </Message> <MessageDetail> No type was found that matches the controller named 'Favorites'. </MessageDetail> </Error> ``` Any help would be greatly appreciated, I'm losing my mind a little bit over here. :) Thanks!