Fatal error: Uncaught Error: Class 'Ai1ec_Less_Variable' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/less/variable/color.php on line 13

Error: Class 'Ai1ec_Less_Variable' not found in /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/less/variable/color.php on line 13

Call Stack:
    0.0018     361272   1. {main}() /srv/drbd-web/home/chelix/public_html/wp-content/plugins/all-in-one-event-calendar/lib/less/variable/color.php:0