I just upgraded K2 via FTP I can access the backend admin ok but when it comes to the front end I am encountering an error:
Fatal error: Class 'CBuser' not found in /home/crosbya1/public_html/fightingyourcorner.com/components/com_k2/helpers/utilities.php on line 24

I cannot uninstall k2 because I have k2 articles critical to the site. Plaese need your urgent help!