Experiencing Error

Jul 13, 2014 at 2:22 AM
I download OpenForum.dll from CodePlex. I'm using VS2010 MVC2 to implement openforum and having the following error.

Method not found: 'System.Web.Mvc.HtmlHelper System.Web.Mvc.ViewPage.get_Html()'."

Any idea what I'm doing wrong or what I'm missing?

Thank you