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/extensions/vendor/facebook/graph-sdk/src/Facebook/Facebook.php:139 Stack trace: #0 /var/www/html/controllers/users.controller.php(439): Facebook\Facebook->__construct(Array) #1 /var/www/html/views/template.php(86): UsersController::socialConnect('facebook', 'https://web-eco...') #2 /var/www/html/controllers/template.controller.php(14): include('/var/www/html/v...') #3 /var/www/html/index.php(25): TemplateController->index() #4 {main} thrown in /var/www/html/extensions/vendor/facebook/graph-sdk/src/Facebook/Facebook.php on line 139