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