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();
 }

}

Dotnetnuke site constantly to recreate the domain application: "The AppDomain shut down because of the hosting environment."

I've made a site using CMS DotNetNuke. On my developing machine it worked very good. After placing It into the hosting I've noticed that pages, especially the first opened very slowly. I looked into site's Event Viewer and see that the application domain recreated several times a minute. There are consistent records:

Application Shutting Down. Shutdown Details: The AppDomain shut down because of the hosting environment.

Application Started.

Operation of Re-creation of domain application is not fast, and it leads to lower the productivity of the website (slowly loading of pages).