Fatal error: Uncaught Error: Interface 'Twig_Extensions_GrammarInterface' not found in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/twig/extensions/lib/Twig/Extensions/Grammar.php:15 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/simplesamlphp_idp/vendor/twig/extensions/lib/Twig/Extensions/Grammar.php on line 15