Fatal error: Uncaught Error: Class 'Twig\Extension\AbstractExtension' not found in /var/www/legtux.org/users/weboconsulting/www/vendor/symfony/twig-bridge/Extension/SerializerExtension.php:20 Stack trace: #0 {main} thrown in /var/www/legtux.org/users/weboconsulting/www/vendor/symfony/twig-bridge/Extension/SerializerExtension.php on line 20