ASP.NET MVC 2 Preview 1 - Problem compiling StructureMap Controller Factory

I have a project for which I use StructureMap for dependency injection. The project compiles fine as a MVC project but after moving everything to a MVC2 project I am now receiving the following error:

Test.Web.Controllers.StructureMapControllerFactory.GetControllerInstance(System.Type)': no suitable method found to override C:\Test\Web\Controllers\StructureMapControllerFactory.cs 11 40 Test.Web

Here is my StructureMapControllerFactory:

using System;
using System.Web.Mvc;
using StructureMap;

namespace Test.Web.Controllers
{
    public class StructureMapControllerFactory : DefaultControllerFactory
    {

        protected override IController GetControllerInstance(Type controllerType)**
        {

            IController result = null;
            try
            {
                if (controllerType == null) return base.GetControllerInstance(controllerType);
                result = ObjectFactory.GetInstance(controllerType) as Controller;

            }
            catch (StructureMapException)
            {
                System.Diagnostics.Debug.WriteLine(ObjectFactory.WhatDoIHave());
                throw;
            }

            return result;
        }

    }
}

I have found one post semi-related to this issue but it did not offer any insight as to how to resolve my issue: MVC 2 preview 1 - methods with parameters in the controller fail to load

Obviously I must be missing a change from the 1.0-2.0 progression, but I am not sure what changed. Any help is always appreciated.