Fatal error: Uncaught Error: Class 'Twig_Extension' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/twig/ai1ec-extension.php on line 12

Error: Class 'Twig_Extension' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/twig/ai1ec-extension.php on line 12

Call Stack:
    0.0001     361072   1. {main}() /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/twig/ai1ec-extension.php:0