Fatal error: Uncaught Error: Interface 'Symfony\Component\HttpFoundation\Exception\RequestExceptionInterface' not found in /opt/lampp/htdocs/vendor/symfony/http-foundation/Exception/ConflictingHeadersException.php:19 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/vendor/symfony/http-foundation/Exception/ConflictingHeadersException.php on line 19