I am getting this error when running my website :
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'sanitize_comment_cookies' not found or invalid function name in /homepages/9/d346623364/htdocs/wp-includes/class-wp-hook.php on line 286
Fatal error: Cannot redeclare comment_exists() (previously declared in /homepages/9/d346623364/htdocs/wp-includes/comment.php:27) in /homepages/9/d346623364/htdocs/wp-admin/includes/comment.php on line 43
Thanks for your help !