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 /var/www/html/web/extensions/vendor/facebook/graph-sdk/src/Facebook/Facebook.php:139 Stack trace: #0 /var/www/html/web/controllers/users.controller.php(438): Facebook\Facebook->__construct() #1 /var/www/html/web/views/template.php(87): UsersController::socialConnect() #2 /var/www/html/web/controllers/template.controller.php(14): include('...') #3 /var/www/html/web/index.php(25): TemplateController->index() #4 {main} thrown in /var/www/html/web/extensions/vendor/facebook/graph-sdk/src/Facebook/Facebook.php on line 139