title: Could not load file or assembly 'System.Web.Mvc, Version=4.0.0.1' or one of its dependencies. The system cannot find the file specified
body: <p>I upgraded my solution from MVC 3 to MVC 4 due to required code (DayPilot MVC - Calendar Controls).  Everything works on my laptop, where I developed the project, now I need to push this to UAT, and on the server, I get this following error:</p>
  
  <p><a href="https://i.stack.imgur.com/dvisc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dvisc.png" alt="Server Error"></a></p>
  
  <p>I tried to install the MVC version via nuget, and update everything, and still nothing.  Any ideas where to look or what to change, will be highly appreciated.</p>