ASP.net MVC 5 Areas in existing project not working

Question

I've been trying to set up a new Area in my current project following details instructions but I'm not able to get a successful result.

Could somebody help me, please? Here is my code so far:

RouteConfig.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace MesaServicio
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Main_default",
                url: "{controller}/{action}/{id}",
                defaults: new {
                    controller = "Home",
                    action = "Index",
                    id = UrlParameter.Optional },
                namespaces: new string[] { "MesaServicio.Controllers" }
            );


            routes.MapRoute(
               name: "signin-google",
               url: "signin-google",
               defaults: new
                   {
                       controller = "Account",
                       action = "ExternalLoginCallback"
                   },
                namespaces: new string[] { "MesaServicio.Controllers" }
               );
        }
    }
}

AdminAreaRegistration.cs

using System.Web.Mvc;

namespace MesaServicio.Areas.Admin
{
    public class AdminAreaRegistration : AreaRegistration 
    {
        public override string AreaName 
        {
            get 
            {
                return "Admin";
            }
        }

        public override void RegisterArea(AreaRegistrationContext context) 
        {
            context.MapRoute(
                "Admin_default",
                "Admin/{controller}/{action}/{id}",
                new { controller="Admin", action = "Index", id = UrlParameter.Optional },
                namespaces: new[] { "MesaServicio.Areas.Admin.Controllers" }
            );
        }
    }
}

AdminController.cs

using System.Linq;
using System.Web.Mvc;
using MesaServicio.Models;

namespace MesaServicio.Areas.Admin.Controllers
{
    public class AdminController : Controller
    {
        private ApplicationDbContext db = new ApplicationDbContext();

        // GET: Admin/Admin
        public ActionResult Prueba()
        {
            return View(db.Corps.ToList());
        }
    }
}

Index.cshtml

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

Area files structure screenshot

File structure

Global.asax.cs

using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace MesaServicio
{
    public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }
}

Link trigger

<li><a href="@Url.Action("Index","Admin", new {area = "admin" })"><i class="fa fa-circle-o"></i> Admin</a></li>

RESULT

https://localhost:44306/admin/

Server Error in '/' Application.

No parameterless constructor defined for this object.

Answer 1

AdminControllerdoesn't have an Index action, it instead has a Prueba action. Try renaming method Prueba to Index.