Warning: include_once(./config/database.php): failed to open stream: No such file or directory in D:\xampp\htdocs\api\backup\register.php on line 2

Warning: include_once(): Failed opening './config/database.php' for inclusion (include_path='D:\xampp\php\PEAR') in D:\xampp\htdocs\api\backup\register.php on line 2

Fatal error: Uncaught Error: Class 'DatabaseService' not found in D:\xampp\htdocs\api\backup\register.php:16 Stack trace: #0 {main} thrown in D:\xampp\htdocs\api\backup\register.php on line 16