Dear Sir / Madam

I have problem in front-end page after upgrade joomla to 3.6 before then i used k2 2.69 and joomla 3.5.1 normally but now i have Big problem because my author doesn't sent article from font-end .

I can't update k2 to 2.7 because i using k2store maybe it's not working with k2 2.7 .

I hope your team help me and another people .

Best Regards,
Amir

Unfortunately the only way is to update K2Store and K2 to their latest version. Even better user 2.7.1 github.com/getk2/k2

K2Store works fine with the latest version of K2, but just in case backup before you update.

Hello,

I am getting a fatal error as well when I have updated to Joomla 3.6 and also updated the Advanced Module. I have the Advanced Module off, but when I have it on I get this error:

Warning: require(/home/cohemplo/public_html/modules/mod_k2_content/tmpl/default.php): failed to open stream: No such file or directory in /home/cohemplo/public_html/modules/mod_k2_content/mod_k2_content.php on line 55

Fatal error: require(): Failed opening required '/home/cohemplo/public_html/modules/mod_k2_content/tmpl/default.php' (include_path='.:/usr/local/php54/pear') in /home/cohemplo/public_html/modules/mod_k2_content/mod_k2_content.php on line 55

I have contacted Regular Labs and they are advising me to seek your assistance.

I am not sure if this went through?

Hello,

I am getting a fatal error as well when I have updated to Joomla 3.6 and also updated the Advanced Module. I have the Advanced Module off, but when I have it on I get this error:

Warning: require(/home/cohemplo/public_html/modules/mod_k2_content/tmpl/default.php): failed to open stream: No such file or directory in /home/cohemplo/public_html/modules/mod_k2_content/mod_k2_content.php on line 55

Fatal error: require(): Failed opening required '/home/cohemplo/public_html/modules/mod_k2_content/tmpl/default.php' (include_path='.:/usr/local/php54/pear') in /home/cohemplo/public_html/modules/mod_k2_content/mod_k2_content.php on line 55

I have contacted Regular Labs and they are advising me to seek your assistance.

They are correct to do so.
It seems that some required files are missing.
Is the /home/cohemplo/public_html/modules/mod_k2_content/tmpl/default.php with '/home/cohemplo/public_html' being your Joomla!'s root path there?

Did you uninstall K2 at any point?