Добавьте файлы проекта.

SvetoforVKBot/App_Start/WebApiConfig.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+using System.Web.Http;
+
+namespace SvetoforVKBot.App_Start
+{
+    public class WebApiConfig
+    {
+        public static void Register(HttpConfiguration config)
+
+        {
+
+            config.MapHttpAttributeRoutes();
+
+            config.Routes.MapHttpRoute(
+
+            name: "DefaultApi",
+
+            routeTemplate: "api/{controller}/{id}",
+
+            defaults: new { id = RouteParameter.Optional }
+
+            );
+        }
+    }
+}