Minimal DXA 1.6 Core area registration. Without this the DXA webapp cannot use the framework controllers. Those controllers are not in the core module, but are in the ControllerAreaName "Core"

CoreAreaRegistration.cs

namespace MyWebApp.Web.Site.Areas.Core
{
    using Sdl.Web.Common.Models;
    using Sdl.Web.Mvc.Configuration;

    public class CoreAreaRegistration : BaseAreaRegistration 
    {
        public override string AreaName => "Core";

        protected override void RegisterAllViewModels()
        {
        }
    }
}