I am trying to create a test SurfaceController and view in Umbraco 7. Following the details in the documentation

I think I need to create a plugin controller.

I have created a very simple one and put the controller in an area ie

/Umbraco/TimCDev/timCTest.cs

I have put the corresponding view

/Umbraco/App_Plugins/Views/Shared/timCTest.cshtml

I then forced Umbraco to recompile by editing and saving web.config (I am using a hosted version of Umbraco, so don't have a VIsual Studio project).

I then browsed to (domain)/Umbraco/TimCDev/timCTest

and get the following error

Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.

Have I done something wrong, or is this a config change needed?

My controller, by the way is

using System.Web.Mvc;
using Umbraco.Web.Mvc;
using Umbraco.Web.Mvc.SurfaceController


[PluginController("TimCDev")]
    public class timCTestController : Umbraco.Web.Mvc.SurfaceController
    {       

        public ActionResult Index()
        {
            return Content("Just a test");
        }
    }