title: Unhandled exception in VS extension
body: <p>I have tried creating a syntax highlighter for a custom file definition. I get an exception when its loaded. I have added the /log parameter to devenv to get a log.</p>
  
  <pre><code>
  335 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is COMMENT   Editor or Editor Extension 2010/08/18 06:47:56.726 
  336 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is STRING   Editor or Editor Extension 2010/08/18 06:47:56.730 
  337 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is COMMENT   Editor or Editor Extension 2010/08/18 06:47:57.046 
  338 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is STRING   Editor or Editor Extension 2010/08/18 06:47:57.048 
  339 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is COMMENT   Editor or Editor Extension 2010/08/18 06:47:57.078 
  340 ERROR System.Exception: Duplicate EditorFormatDefinition exports with identical NameAttribute metadata exist. Duplicate name attribute is STRING 
  </code></pre>
  
  <p>I cannot find any duplicates in my code. If needed code can be provided.</p>
  
  <p>Best regards,
  Michael</p>