Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException' not found in /var/www/html/test-project/my-app/vendor/laravel/framework/src/Illuminate/Foundation/Http/Exceptions/MaintenanceModeException.php:13 Stack trace: #0 {main} thrown in /var/www/html/test-project/my-app/vendor/laravel/framework/src/Illuminate/Foundation/Http/Exceptions/MaintenanceModeException.php on line 13