Fatal error: Uncaught TypeError: PDO::__construct(): Argument #2 ($username) must be of type ?string, false given in /var/www/html/w1/includes/Database.php:38 Stack trace: #0 /var/www/html/w1/includes/Database.php(38): PDO->__construct() #1 /var/www/html/w1/includes/Database.php(47): App\Database->__construct() #2 /var/www/html/w1/includes/Database.php(59): App\Database::getInstance() #3 /var/www/html/w1/services/AuthService.php(17): App\Database::connect() #4 /var/www/html/w1/controllers/AuthController.php(19): App\Services\AuthService->__construct() #5 /var/www/html/w1/includes/Router.php(89): App\Controllers\AuthController->__construct() #6 /var/www/html/w1/public/index.php(92): App\Router->dispatch() #7 {main} thrown in /var/www/html/w1/includes/Database.php on line 38