When setting up an weekly recurring event, Joomla errors with error message "Too few arguments to function EventsModelEvent::create_recurring_instances(), 2 passed in /var/www/web54/htdocs/joomla/administrator/components/com_calendarplanner/models/event.php on line 291 and exactly 3 expected"

Repeats checkbox is checked, end of event is some weeks later and repeat 2nd field (week) is filled with one. Is ther e anything wrong wirth repeat syntax? please help me!