title: ASP.NET MVC Error: 'System.Web.Helpers.Validation' does not contain a definition for 'RequireField'
body: <p>I have created empty project and have been following this <a href="http://www.asp.net/web-pages/tutorials/working-with-pages/4-working-with-forms" rel="nofollow noreferrer">tutorial</a>:</p>
  
  <p>But i am getting the following error:</p>
  
  <p><img src="https://i.stack.imgur.com/1VLRh.png" alt="enter image description here"></p>
  
  <p>Here is my <strong>WebConfig</strong> in Views folder:</p>
  
  <p><img src="https://i.stack.imgur.com/K6TIb.png" alt="enter image description here"></p>
  
  <p>What can be causing the problem? </p>
  
  <p>Still getting the error:
  <img src="https://i.stack.imgur.com/tPO4u.png" alt="enter image description here"></p>