title: No EditorOptionDefinition Export Found Error
body: <p>In Visual Studio 2013 I started getting the following error when trying to open C# files:</p>
  
  <pre><code>No EditorOptionDefinition export found for the given option name:
  Tabs/ConvertTabsToSpaces
  Parameter name: optionID
  </code></pre>
  
  <p>I was having no issues all morning until I closed and re-opened a C# solution I was working on when this error started. I checked and this error happens when I open any C# project on this computer. I also tried opening the same project from my other computer and it works fine, so this is not a project error.</p>
  
  <p>I have not changed any VS settings, and I was just trying to open the package manager when this presented itself.</p>
  
  <p>I am at a loss and Dr. Google is not of much help thus far. </p>