Fatal error: Uncaught Error: Interface "Symfony\Component\HttpFoundation\RequestMatcherInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/http-foundation/RequestMatcher.php:19 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/http-foundation/RequestMatcher.php on line 19