Web API 2, Routing not working, at two different Controller

public static void RegisterRoutes(HttpRouteCollection routes) {

    routes.MapHttpRoute(
        "UserRolesHttpRoute",
        "api/users/{key}/roles",
        new { controller = "UserRoles" });

    routes.MapHttpRoute(
        "AffiliateShipmentsHttpRoute",
        "api/affiliates/{key}/shipments",
        new { controller = "AffiliateShipments" });

    routes.MapHttpRoute(
        "ShipmentStatesHttpRoute",
        "api/shipments/{key}/shipmentstates",
        new { controller = "ShipmentStates" });

    routes.MapHttpRoute(
        "AffiliateShipmentShipmentStatesHttpRoute",
        "api/affiliates/{key}/shipments/{shipmentKey}/shipmentstates",
        new { controller = "AffiliateShipmentShipmentStates" });

    routes.MapHttpRoute(
        "DefaultHttpRoute",
        "api/{controller}/{key}",
        new { key = RouteParameter.Optional });
}