Crash when giving credits using classifieds/Directory

While trying to resolve another issue I tried to give credits to all users from both Classifieds and Directory Listings.

Directory Listings seems to just refresh the page and nothing happens.

Classifieds produces the following error:

Fatal error: Call to undefined method Classifieds_Core_Admin::update_user_credits() in /home/content/67/10196467/html/wp-content/plugins/classifieds/core/admin.php on line 250

Using Blogs MU on WP 3.5 - all themes and plugins are up to date.

Thanks