weird error

• photoaddictsa

• February 27, 2018 at 10:10 pm

Hi,

I recently noticed the following error;

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'sk_display_custom_fields' not found or invalid function name in /usr/www/users/xxxx/xxxx/wp-includes/class-wp-hook.php on line 286

not sure how to solve it, any suggestions?