Attribute routes on multiple controllers match the requested url

I am using a web api project where I used two controllers:

The first controller looks like this:

public class SmartlingController : BaseApiController
{
    [Route("api/smartling/ProcessSmartlingTranslation")]
    [VersionedRoute("", 1)]
    [ResponseType(typeof(HttpResponseMessage))]
    [HttpPost]
    public IHttpActionResult ProcessSmartlingTranslation(HttpRequestMessage request)
    {
       //some business logic
    }
}

      

        
        
        
      

    

Second controller:

public class CommentsController : BaseApiController
{
    [Route("api/comments/GetAndPostBlogComments")]
    [VersionedRoute("", 1)]
    [ResponseType(typeof(HttpResponseMessage))]
    [HttpPost]
    public IHttpActionResult GetAndPostBlogComments([FromBody] BlogAndStoryComment comment)
    {
       //some business logic
    }
    [Route("api/comments/GetAndPostStoryComments")]
    [VersionedRoute("", 1)]
    [ResponseType(typeof(HttpResponseMessage))]
    [HttpPost]
    public IHttpActionResult GetAndPostStoryComments([FromBody] BlogAndStoryComment comment)
    {
       //some business logic
    }
}

      

        
        
        
      

    

Below is the webapi registration method:

public static void Register(HttpConfiguration config)
{
    // Web API routes
    config.MapHttpAttributeRoutes();
    config.Routes.MapHttpRoute(
        "DefaultApi",
        "api/{controller}/{action}/{id}",
        new { id = RouteParameter.Optional }
    );
    var f = new FormUrlEncodedMediaTypeFormatter();
    f.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/json"));
    f.SupportedMediaTypes.Add(new MediaTypeHeaderValue("application/x-www-form-urlencoded"));
    config.Formatters.Add(f);
    var enableCorsAttribute = new EnableCorsAttribute("*",
                                       "Origin, Content-Type, Accept",
                                       "GET, PUT, POST, DELETE, OPTIONS");
    config.EnableCors(enableCorsAttribute);
}

      

        
        
        
      

    

Where is my code wrong here and how can I fix this problem?