Fatal error: Uncaught Error: Class 'Twig_Extension' not found in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/Extension/Optimizer.php:11 Stack trace: #0 {main} thrown in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/Extension/Optimizer.php on line 11