Hi,

I was on joomla 3.6.2 and it told me to update. I updated the extensions first, then updated joomla to 3.6.4. I don't think I did anything to K2, and I have 2.7.1 installed.

The backend still works fine, but the frontend doesn't and error reporting says:

Fatal error: Class 'K2Model' not found in /home/grancanariainfo/public_html/components/com_k2/helpers/route.php on line 311

(above it a whole list of warnings, these two a lot of times but with different line numbers:

Notice: Use of undefined constant K2_JVERSION - assumed 'K2_JVERSION' in /home/grancanariainfo/public_html/plugins/search/k2/k2.php on line 167
Notice: Use of undefined constant K2_JVERSION - assumed 'K2_JVERSION' in /home/grancanariainfo/public_html/components/com_k2/helpers/route.php on line 184
)

What should I do?
Thanks!

Hello the notices will not affect your site's functionality.
In production sites you should disable the error reporting.

Now, can you try the following?
a) Install K2's DEV version github.com/getk2/k2
b) Disable all 3rd party K2 extensions.

Thanks Krikor, for your reply!

It took me almost two weeks to recover from what happened mentally, but today I decided to give it another shot.

I did this:

• update joomla
• update k2 master zip
• clear cache
• error reporting maximum

lots of these warnings on the frontend homepage::
Notice: Use of undefined constant K2_JVERSION - assumed 'K2_JVERSION' in /home/grancanariainfo/public_html/components/com_k2/helpers/route.php on line 184
and:
Fatal error: Class 'K2Model' not found in /home/grancanariainfo/public_html/components/com_k2/helpers/route.php on line 311

• disabled all k2 plugins
• homepage: page not found (no more error reporting, joomla sef plugin takes over and shows 'matches')
• enabled k2 system plugins
• back to fatal error again, k2model
• restored backup

p.s. every action in the admin part takes a lot of time: to get to the next page after hitting a button to make it do something, takes a minute or so to actually do something.

What should I do?
Thanks!

Hello Lex,

Which K2 plugins are you using?
Can you try using a different template?