Fatal error: Uncaught Error: Interface "Symfony\Component\Yaml\Exception\ExceptionInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/yaml/Exception/RuntimeException.php:19 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/yaml/Exception/RuntimeException.php on line 19