Debug in WP backend

Question

The problem - I get these warnings each time I login to /admin page in WP. Depending on which browser I use, there are problems with these:

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'add_role_caps_to_job_agent' not found or invalid function name in /var/www/public_html/wp-includes/class-wp-hook.php on line 298

Warning: Cannot modify header information - headers already sent by (output started at /var/www/public_html/wp-includes/class-wp-hook.php:298) in /var/www//public_html/wp-includes/option.php on line 837

Warning: Cannot modify header information - headers already sent by (output started at /var/www/public_html/wp-includes/class-wp-hook.php:298) in /var/www/public_html/wp-includes/option.php on line 838

I've tried to look into option.php and class-wp.-hook.php but I've not much experience or knowledge what to look for.

Can anyone help?

Answer 1

The warning states the issue is coming from custom code as in core WP no function as add_role_caps_to_job_agent exists. Try searching for add_role_caps_to_job_agent in wp-content, to see how this function is getting called and fix or uncomment the call.

The other two notices will disappear once the first notice is solved as WP is trying to set/send headers which is possible only, if nothing was printed to the screen before.