Fatal error: Uncaught Error: Interface 'Ai1ec_Filter_Interface' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/app/model/filter/int.php on line 12

Error: Interface 'Ai1ec_Filter_Interface' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/app/model/filter/int.php on line 12

Call Stack:
    0.0008     360048   1. {main}() /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/app/model/filter/int.php:0