Hi,
I just installed K2 for first time.

Ive made new category and one article for that category.
And I created new menu item - k2 categories,called Blog.
When I open that blog page I have a problem - see image1

Can you please help?

Sorry image1 is to small to see so I made image2 and image3 so You can see better.

Hello Filip,

These are notices raised from Joomla!'s cache and K2 and not actual errors.
They will not affect your site's functionality or performance in any way.

You should switch error reporting to default when you push your site live or if you want these notices hidden.

Hi,
Thanks for your answer.

Error reporting is set to system default but when I turned error reporting to none then these notices were hidden.