ASP.NET MVC 2 Error rised using RenderAction : The controller for path '/' was not found or does not implement IController.

When I try to use RenderAction in ASP.NET MVC2 view:

<%Html.RenderAction("BrowserVersion", "HomeController"); %>

I got the error below:

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

Code for HomeController:

public class HomeController : Controller
{

 [ChildActionOnly]
 public ActionResult BrowserName()
 {
     ViewData["BrowserName"] = Request.Browser.Browser;
     return View();
 }

}