Error with controller rendering - "does not implement IController"

Question

Using Sitecore 8.2

I have multiple MVC projects in a VS Solution. For each project, I remove the RouteConfig.cs, but for one, I forgot and clicked on publish. (I'm not sure if thats the reason for the error).

Now the page thows this error -

The controller for path '/en/home' was not found or does not implement IController.

I removed the RouteConfig.cs and published again but no luck. Also, none of the MVC projects have Global.asax included.

I also tried giving the full path in controller rendering.

Controller: Sitecore.Feature.Teasers.Controllers.TeasersController, Sitecore.Feature.Teasers  
Controller Action: RenderTeaser

TeasersController.cs

namespace Sitecore.Feature.Teasers.Controllers
{
    public class TeasersController : SitecoreController
    {
        // GET: Teasers
        public ActionResult RenderTeaser()
        {
            IEnumerable<Item> teasers = GetTeasers();
            return View("~/Views/Teasers/Teasers.cshtml", teasers);
        }        
    }
}

How can I fix this. Thank you.

Answer 1

You need to inherit from Controller, not SitecoreController.

SitecoreController is Sitecore's own controller (duh, hehe) used for Sitecore's View Rendering components - but is not the one you are meant to inherit from for your own Controller Rendering components.

See also: How To Make Sitecore Use a MVC Controller, Controller Renderings Explained

Answer 2

For other still seeing this issue, here is one more scenario: In my case I was seeing various DLL issues, so I decided to replace bin of my project with an bin of new instance. Then saw this error. Clean and built my project and then published the code from Visual studio. Everything then started working as expected.

Answer 3

Looks like the dlls are in the temporary cache. Simply try an IIS recycle or reset. And check.