Fatal error: Uncaught Error: Interface 'Twig_FunctionInterface' not found in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/Function.php:20 Stack trace: #0 {main} thrown in /home/sven/www/svenk.org/~koeppel/src/lib/Twig/Function.php on line 20