errors after update - BuddyPress Group Calendar 1.4.7

please find attached screenshot
immediately after update to 1.4.7 errors are shown in both wp admin and front end.
i switched from php 7.1 to 7 and the errors still occurred.
deactivated a few plugins without success and when BuddyPress Group Calendar is network deactivated the errors are gone.
support access granted for your perusal ;
your kind assistance in this would be greatly appreciated.