Warning: require_once(../includes/notification/Firebase/TokenGenerator.php): Failed to open stream: No such file or directory in /var/www/html/includes/notification/firebase_cloud_messaging.handler.class.php on line 3

Fatal error: Uncaught Error: Failed opening required '../includes/notification/Firebase/TokenGenerator.php' (include_path='.:/usr/share/php') in /var/www/html/includes/notification/firebase_cloud_messaging.handler.class.php:3 Stack trace: #0 {main} thrown in /var/www/html/includes/notification/firebase_cloud_messaging.handler.class.php on line 3