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