Hi all, help please 
On this website www.smashtronics.co.za - we are getting this error and we have no idea how to fix it. we have tried disabling all the plugins but we had no joy.
We don’t know php - i couldn’t even begin to tell what php to look in or what to do - so please explain in laymans terms. Thanks in advance. Oonie
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘prefix_add_footer_styles’ not found or invalid function name in /home/smashhzo/public_html/wp-includes/plugin.php on line 524