Fatal error: Uncaught PDOException: SQLSTATE[HY000] [1049] Unknown database 'surveillance_app' in C:\xampp\htdocs\all\device\config.php:18 Stack trace: #0 C:\xampp\htdocs\all\device\index.php(2): require_once() #1 {main} thrown in C:\xampp\htdocs\all\device\config.php on line 18