Fatal error: Uncaught Error: Class 'Ai1ec_Notification' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/notification/admin.php on line 12

Error: Class 'Ai1ec_Notification' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/notification/admin.php on line 12

Call Stack:
    0.0022     361592   1. {main}() /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/notification/admin.php:0