These are coming from a 3rd party K2 extension.
Try disabling this extension (mefgfork2) as well.

Hi,
Disabled mefgfork2 - error msgs disappeared when editing a category.

However, still can't edit a K2 item:
Fatal error: Cannot declare class upload, because the name is already in use in /home/.../public_html/administrator/components/com_k2/lib/class.upload.php on line 624

Cheers,

Hi,
There is another instance of class.upload.php in /media/k2/assets/vendors/verot/class.upload.php/src/
Removing the directory leads to another fatal error - missing the verot version of class.upload.php

This issue has only arisen since updating K2 to 2.8. The verot class was updated as part of the k2 2.8 upgrade.

Kind regards,

As you can see -> github.com/getk2/k2/tree/master/components/com_k2 the /lib/ folder is not present in the 2.8.x version.

Try renaming that folder and see if the error is gone. Better yet clear all caches and reinstall 2.8 before performing any tasks.

Hi,

Thanks for following up on this.

I'm wondering if my upgrade went bad or something, since I still had these files in my structure, despite upgrading from the Joomla Extensions/manage/Update route.

I've now downloaded the 2.8 zip & installed that over K2 using Extensions/manage/Install route.

K2 now says it's running 2.8 -> (Last update: August 18th, 2017 - Version 2.8.0)

However, I'm still getting fatal errors on save:

Warning: require_once(/home/.../public_html/administrator/components/com_k2/lib/class.upload.php): failed to open stream: No such file or directory in /home/..../public_html/plugins/system/k2multiimages/K2MultiImages/administrator/models/itemmultiimages.php on line 5

Fatal error: require_once(): Failed opening required '/home/.../public_html/administrator/components/com_k2/lib/class.upload.php' (include_path='.:/usr/local/php70/pear') in /home/.../public_html/plugins/system/k2multiimages/K2MultiImages/administrator/models/itemmultiimages.php on line 5

However, disabling the k2multiimages plugin allows me to save items. Perhaps this extension needs updating to account for the removal of class.upload.php from the lib folder?

Thanks again for your assistance - much appreciated.

Regards,
Eddie

Yes, the culprit was found :)
Report this issue to the K2 Multi Image devs so they can provide a solution and a possible update.