"Event Details" Error after upgrade

I just upgraded to the most recent version. Now when I click "Add Event" as an admin in the back-end, I get an error message in the 'Event Details' section of the page:

Catchable fatal error: Object of class Eab_EventModel could not be converted to string in /nfs/c08/h03/mnt/115846/domains/safemanagement.org/html/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 1163