Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Loader\LoaderResolverInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Loader/LoaderResolver.php:22 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Loader/LoaderResolver.php on line 22