title: FB Graph Error: "(#100) User must be on whitelist"
body: <p>I'm calling</p>
  
  <pre><code>https://graph.facebook.com/{the id of one of my app's actions}
  </code></pre>
  
  <p>and getting the following response body:</p>
  
  <pre><code>{
    "error": {
      "message": "(#100) User must be on whitelist", 
      "type": "OAuthException", 
      "code": 100
    }
  }
  </code></pre>
  
  <p>I'm an admin on the app in question.  Anyone have any idea what this error means?</p>