Hello, I'm having problems with k2 using extra campor and Save new articles.
J3.5.1 and K2 2.7.0 installed. See the image below for an error when trying to save the article.

In other articles is showing the line: Warning: trim () expects parameter 1 to be string, array given Beheerder in /home/****/public_html/new/libraries/vendor/joomla/string/src/phputf8/trim.php on line 61

In Adiministrator some article appears the line: Warning: htmlspecialchars () expects parameter 1 to be string, array given Beheerder in /home/****/public_html/new/administrator/components/com_k2/models/extrafield.php on line 308

Only this site this is happening, using Fields Extras. In other site there are no errors with the K2 2.7.0.

http://imgur.com/q6uKhdu

PHP 5.5 enabled on the server.
Thank you.

Hello Omar,

This has been resolved,
github.com/getk2/k2/commit/6cff7526e292321479113783d5d2ea80ae7752a1

In the items that this warning appears " Warning: htmlspecialchars () expects parameter 1 to be string, array given Beheerder in /home/****/public_html/new/administrator/components/com_k2/models/extrafield.php on line 30" is there a K2 plugin present or is it stock K2?

Hello, K2 returned to Save correctly with github.com the tip with some pqeuenos errors in CSS Admin.

The errors mentioned in the Item Management and pages remain some items in other everything is normal.
No external plugin only installed the K2 resources. The problem seems to be the Fields Extras. On other sites that do not use Fields Extras K2 works well.

Screen: imgur.com/uFCrbQI

More errors in the K2 now Options ... is problem after problem ..

Strict Standards: Declaration of K2Element :: render () shouldnt be compatible with JFormField :: render ($ layoutId, $ data = Array) in / home / **** / public_html / new / administrator / components / com_k2 / elements / base .php on line 25

X-(

This is a notice (not even a notice too) it is not a problem and it will not affect your site's functionality.

If this is a production site, disable error to hide these strict standards notices.

And not only errors. It is very good design in new k2, easy to use as ever and fast even on shared server. I am very grateful to work for you for this excellent component. I think he should already be in native Joomla.

Thank you.

Thank you Omar for your kind words :)

I am seeing the same error message :(

Deactivate error reporting Joe when you are on a production site.
Strict Standards is not a notice and it will not affect your site's functionality.