Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\Loader" not found in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Loader/FileLoader.php:26 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/symfony/config/Loader/FileLoader.php on line 26