title: Facebook OAUTH error
body: <p>I am trying to authenticate my application using Facebook PHP SDK. It is working fine, but for some users it will show the following users</p>
  
  <pre><code>{
     "error": {
        "type": "OAuthException",
        "message": "An unexpected error has occurred. Please retry your request later."
     }
  }
  </code></pre>
  
  <p>It is creating a access token. But still it shows the errors. </p>