I have noticed a lot of error logs coming up on my hosting. After looking through it these logs match with the access logs. everytime a user/crawler visits the site it throws this error.
mod_fcgid: stderr: PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘thematic_access’ not found or invalid function name in /var/www/vhosts/domain.com/httpdocs/wp-includes/plugin.php on line 505
Would anyone have any suggestion in regards to this?