Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Resource\ResourceInterface" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Resource/SelfCheckingResourceInterface.php:20 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Resource/SelfCheckingResourceInterface.php on line 20