Fatal error: Uncaught Error: Class 'Twig\Extension\AbstractExtension' not found in /home/eberhardschwarze/public_html/vendor/knplabs/knp-menu/src/Knp/Menu/Twig/MenuExtension.php:13 Stack trace: #0 {main} thrown in /home/eberhardschwarze/public_html/vendor/knplabs/knp-menu/src/Knp/Menu/Twig/MenuExtension.php on line 13