I tried to reset one of our courses to prepare it for the new term and I got the following lines and the Fatal Error msg at the end.
Reset: News forum
Reset: A single simple discussion
Reset: Each person posts one discussion
Reset: Standard forum for general use
Reset: Remove forum subscriptions
Fatal error: Call to undefined function groups_remove_all_group_members() in /home/shvxeeat/public_html/psulms/lib/moodlelib.php on line 3226