Fatal error: Uncaught Facebook\Exceptions\FacebookSDKException: Required "app_id" key not supplied in config and could not find fallback environment variable "FACEBOOK_APP_ID" in /homepages/42/d998617079/htdocs/web-includes/classes/Facebook/Facebook.class.php:139 Stack trace: #0 /homepages/42/d998617079/htdocs/index.php(14): Facebook\Facebook->__construct() #1 {main} thrown in /homepages/42/d998617079/htdocs/web-includes/classes/Facebook/Facebook.class.php on line 139