Fatal error events plugin

Getting the following error in the site:
PHP Fatal error: Call to undefined method Eab_ArchivedCollection::get_timestamp() in /var/www/html/wp-content/plugins/events-and-bookings/lib/class_eab_collection.php on line 312, referer: http://xxxx.org/resources/wp-cron.php?doing_wp_cron=1496540041.7249341011047363281250

Support access is enabled for Dev site, will need static IP to access FTP.