title: ASP.NET MVC 5 Cannot Add Controller
body: <p>all,</p>
  
  <p>Just wanted to add to the body of knowledge.  I was confounded, trying many solutions, when I couldn't add a controller to just one MVC project.  I was getting the error:</p>
  
  <pre><code>There was an error running the selected code generator:
  'The parameter is incorrect [...] '
  </code></pre>
  
  <p>Answer below...</p>