Error in user manager after upgrade to 6.12.65

I recently upgrade to the 6.12.65 track. I am able to get to the initial page of user manager but when I try to create new user or edit an existing one I get the following fatal error:

/var/www/html/admin/config.php:512 die_freepbx()
[0]: FreePBX is Unable to Continue
[1]: Attempted to load /var/www/html/admin/modules/cos/Cos.class.php but it didn’t define the class Cos

I upgraded all modules through module admin and also uninstalled cxpanel but nothing has resolved the issue so far. Any help would be greatly appreciated!!


Are you using class of service?

That was it!! I was not using it but it was enabled. I disabled it and it’s working now.