Fatal error: Uncaught Error: Interface 'Facebook\HttpClients\FacebookHttpClientInterface' not found in /usr/local/apache/htdocs/plugin/social/libraries/Facebook/HttpClients/FacebookCurlHttpClient.php:34 Stack trace: #0 {main} thrown in /usr/local/apache/htdocs/plugin/social/libraries/Facebook/HttpClients/FacebookCurlHttpClient.php on line 34