BuddyPress.org

“Are you sure you want to do this?”
1. Change theme to bp-default theme
2. Deactivate all plugins except BuddyPress
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/there-was-an-error-saving-group-details-please-try-again-1/?topic_page=1&num=15
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/group-creation-error-are-you-sure-you-want-to-do-this/