Same problem but I believe the K2 support team will find the solution very shortly.

getk2.org/community/New-to-K2-Ask-here-first/163045-Small-upgrade-problem#163160

Hi there,

I just upgraded to the latest version and have an issue. Stupidly I forgot to backup before upgrading to your new K2 release as I thought it was stable and fully tested.

I reinstalled the previous version (K2_v2.5.7) over this latest release but I have lost my 'K2 comments' section on the website. The K2 comments and the comment form fields at the bottom are no longer visible. I am running a Joomla 2.5.7 site.

Assistance really required! I have a French website which is a mirror copy of my other website (I did not install latest release on the French website and everything works fine). Can I copy any files from the French website across to my .co.uk website to solve the issue? If so which files?

Regard the Mini K2 module from Template Plazza, there on their website is a new version updated v.1.2 (Oct 2012 v.1.2 fixed helper.php to be compatible with K2 v.2.6.0) for K2 v2.6.0. Just download, install on top on the old one already installed and empty the cache if is enabled. It should work without any problem. Worked in my case.

regard the error: Model class cpanelModelCpanel not found in file

the fix is by deleting delete the file /administrator/components/com_k2/models/cpanel.php

it works

Ok... so what issues is this error actually causing and what steps actually need to be taken... I think I'll stay away from deleting any files...

I can't see any obvious issues, but I use K2 for very basic things...

At present I'm just gonna hang tight until a bug fix version is released... but I'd really like some insight on what functional issues this causes if anyone can share those.

Wauw - 2 days 1700 views.

Okay Im not the only one having that problem.

Did delete the cpanel file and the error is gone...

Hope to see a fix from the K2 team :)

I am new to K2 and Joomla. My site is down because of this new update I think. Is there anything I can do to get my site to work while waiting for K2 to fix this bug?

Here is the error I get on the front end of my site

Fatal error: Class 'K2Table' not found in /home/partydogz/www.partydogz.com/administrator/components/com_k2/tables/k2user.php on line 13

UPDATE:
I have disabled all K2 items and site is back up so I can start to update again. I do wish to continue learned the K2 product and using it on my site so I am still looking for a fix.

A new release is out :)

And indeed problems fixed, good work!