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 /plugins/fbsdk/v5/Facebook.php:139 Stack trace: #0 /modules/users/facebook.php(46): Facebook\Facebook->__construct() #1 /header.php(490): include('...') #2 /content.php(10): include('...') #3 {main} thrown in /plugins/fbsdk/v5/Facebook.php on line 139