title: FB Graph API - (#3) Application must be whitelisted or users must be testers
body: <p>I have FB App and through it created group, so I can invite/add new members of this group (via Facebook Graph API). It works perfect 4 days ago, but now I get error </p>
  
  <blockquote>
    <p>"(#3) Application must be whitelisted or users must be testers." </p>
  </blockquote>
  
  <p>and I can't add new member again. I can't find anywhere what's a "whitelist" and how to add my App on it. Can anyone advise me?</p>