title: Facebook Graph API: (#200) Permissions error
body: <p>Using <code>/{event-id}/attending</code> method call from iOS. I worked for long time, and nowadays Get no result, and this message. Do you know why? What changed?</p>
  
  <p>In iOS app, list of user is just empty.
  In <code>Graph API Explorer</code> some error I get. I do not know why two results are different? And we it just not works as before?</p>
  
  <p><a href="https://i.stack.imgur.com/qjkQw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qjkQw.png" alt="enter image description here"></a></p>