title: Getting error Error: The given key was not present in the dictionary. in production
body: <p>I am using ASP.Net 4.0 w/ a C# Web service. This also utilizes a C# library, which is working fine in development and with other applications (Skype bot and Windows form)</p>
  
  <p>I am using JQuery to communicate via JSON to the web service. In development, this is working fine. In production, it is partly working. I can use some commands, but other commands simply throw this error:</p>
  
  <pre><code>Error: The given key was not present in the dictionary.
  </code></pre>
  
  <p>I am not certain where to begin with this. I can't step through code because it only happens in prod. I checked the IIS logs, and every request is getting a 200 status, so it appears it is something inside of the app itself. Any ideas where to start with this?</p>