first, its very poor to be displaying errors on a production site…  those should really be disabled…

2nd, not sure how that is occurring..  it says you have a 0 byte css file that is trying to be included…

so not an error and no ill effect, but you get the warning…

three options…

1 – dont display errors on production site (always recommended by php, wp, devs, etc)

2 – find the 0 byte css file (new child theme css?)

3 – disable css combined caching on forum – options – global settings

So it´s the empty child theme that is giving the error. 

Do you have any simple line i can add that dont change anything in particular to get ride of the warning until i have time to add own color etc.

Thanks!

P.S.

How to not display errors on my site? Is that done in the WP admin?

how about a comment?

/* my theme css */

you would turn off errors in your php.ini file…

or in your wp config file, add:

define(‘WP_DEBUG’, false);
define(‘WP_DEBUG_DISPLAY’, false);

Mr Papa said
how about a comment?

/* my theme css */

Haha, i really need a holliday to get my brain working.

Thanks Steve

P.S.

Thanks for the tips above as well.

no worries!  Glad to help!