Hi 8Theme,
On a clean WP4 install, after activating the latest version of the Royal theme and required plugins, the following error appears at the bottom of the website:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /home/marloes/public_html/wp-includes/plugin.php on line 505
When I switch back to a WP core theme the warning dissapears. What is causing this warning? Hope to hear from you soon. Live demo with warning at: http://marloes.bertplantagie.com/
Kind regards,
Joost