I am going through tutorials during 30 day evaluation. In video at 1:53 it can be seen code that is no longer valid since namespace Telerik.Web.Mvc.UI does not exist in sample application.
<h1>Create a Bug</h1>
I've already answered t oyou on your question on SO: stackoverflow.com/.../48082642
I will repeat it here as well, in case if someone else will have the same issue.
Correct method name is BeginFormSitefinity. You wrote BeginFormSiteFinity and error log is saying that it cannot find the method with this name. You should fix your line to: