title: Facebook OAuthException code 190 subcode 490 - user is enrolled in a blocking, logged-in checkpoint
body: <p>Well the title says it all. Does anyone have an idea what the <strong>code 190,  subcode 490</strong> means? (Error validating access token: The user is enrolled in a blocking, logged-in checkpoint) It does not appear in the  <a href="https://developers.facebook.com/docs/graph-api/using-graph-api#errors" rel="noreferrer">official facebook developer error code documentation</a> and not on the <a href="http://fbdevwiki.com/wiki/Error_codes" rel="noreferrer">inofficial wiki page</a> I dug up on SO.</p>
  
  <p>The token in question is used to manage a fanpage for a user (post stuff, change title picture, etc.). For most users this error does not happen but for some it will show with no clue to where the difference might be. </p>
  
  <p>The request that caused the error was a POST to <code>pageId/feed</code>.</p>
  
  <p>We're using Graph API version 2.0</p>