Fatal error: Uncaught Error: Interface 'Twig_NodeVisitorInterface' not found in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/NodeVisitor/Optimizer.php:22 Stack trace: #0 {main} thrown in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/NodeVisitor/Optimizer.php on line 22