title: RDLC Native Error 255
body: <p>I have an ASP.Net site running on 4.5.2, using the report viewer control. All of a sudden on our server, we are getting </p>
  
  <blockquote>
    <p>An unexpected error occurred while compiling expressions. Native
    compiler return value: ‘255’.</p>
  </blockquote>
  
  <p>This is occurring for all of our reports (Most of which haven't been modified in over a year). I am trying to identify what potentially changed and is causing this and am coming up short.</p>
  
  <p>We are on Windows Server 2012.</p>
  
  <p>I have found some articles pointing to an issue that occurs with some security patches. We had 4.6 installed on the server so I updated to 4.6.1 and still same issue occurs</p>