After update from J2.5 to J3 I'm getting this error:

Strict Standards: Declaration of K2Element::render() should be compatible with JFormField::render($layoutId, $data = Array) in /home/beautycent/domains/beautycentre-jolanda.nl/public_html/administrator/components/com_k2/elements/base.php on line 25

Version 2.7.0 is installed on Joomla 3.5.1

Jan

Hello, this is a strict standards declaration (not even a notice).
It will not affect your site's functionality in any way.

Go to your site's global configuration and set error reporting to no.

OK

Thanks a lot!

Jan

You 're welcome Jan.