Warning: Missing argument 4 for Student::add_mandatory_questions_meta() in

Lately and after the last update of the CoursePress plugin users keep on getting these error messages: Warning: Missing argument 4 for Student::add_mandatory_questions_meta() in /home/noel5/public_html/kurs.no-el.no/wp-content/plugins/coursepress/includes/classes/class.student.php on line 774

The error appear after finishing a unit when the courses-dashboard page should come up showing a active link to the next unit. When this error appers, the user can't continue and seems to be stuck in a loop.