title: How do I fix the "compilerVersion" IIS error?
body: <p>I'm getting this exception:</p>
  
  <blockquote>
    <p>System.Configuration.ConfigurationErrorsException: The value for the
    'compilerVersion' attribute in the provider options must be 'v4.0' or
    later if you are compiling for version 4.0 or later of the .NET
    Framework.</p>
  </blockquote>
  
  <p>What should I do to resolve this?</p>