title: 'Ajax' does not exist in the namespace 'System.Web.Mvc'
body: <p>I'm new to ASP.NET MVC 5 and I wanted to build a small project to figure some things out.
  When i opened the project in the browser I got an error saying:</p>
  
  <pre><code>Compiler Error Message: CS0234: The type or namespace name 'Ajax' does not exist in the namespace 'System.Web.Mvc' (are you missing an assembly reference?)
  
  Source Error:
  Line 22:     using System.Web.WebPages; 
  Line 23:     using System.Web.Mvc;      
  Line 24:     using System.Web.Mvc.Ajax;  
  Line 25:     using System.Web.Mvc.Html;  
  Line 26:     using System.Web.Routing;
  </code></pre>
  
  <p>After some googling <a href="http://forums.asp.net/t/1823036.aspx?The%20type%20or%20namespace%20name%20Ajax%20does%20not%20exist">i found out</a> that you had to change "Copy Local" to true but i saw that it was already set to true in my project. Even after a clean and a rebuild this error persists. </p>
  
  <p>So does anyone have an idea about what could cause this error?</p>