Fatal error: Uncaught Error: Class 'Symfony\Component\Debug\Exception\FlattenException' not found in /opt/lampp/htdocs/kuesioner/vendor/symfony/error-handler/Exception/FlattenException.php:27 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/kuesioner/vendor/symfony/error-handler/Exception/FlattenException.php on line 27