title: CS0012: The type 'System.Web.Routing.RouteValueDictionary' is defined in an assembly that is not referenced
body: <p>I got this error using a new "ASP.NET MVC 2 Empty Web Application" project:</p>
  
  <blockquote>
    <p>CS0012: The type
    'System.Web.Routing.RouteValueDictionary'
    is defined in an assembly that is not
    referenced. You must add a reference
    to assembly 'System.Web.Routing,
    Version=3.5.0.0, Culture=neutral,
    PublicKeyToken=31bf3856ad364e35'.</p>
  </blockquote>