Can't Edit quiz after upgrade to 2.8.1

Hello,

Thanks for reading, I recently upgraded to 2.8.1 from a 2.7 version.  The upgrade process went smoothly, however when clicking to edit a quiz I was getting a blank page.  I turned on debugging and now can see the following error:

Fatal error:  Call to undefined function mod_quiz\output\question_get_category_id_from_pagevars() in /var/www/html/mod/quiz/classes/ouput/edit_renderer.php on line 471.

Anyone have any pointers on this issue?  If so, I appreciate it.

Thank you again.

-Roland