errors after update – BuddyPress Group Calendar 1.4.7

hi

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.