Fehlermeldung bzgl Comments Template Line 1334

Ich habe eine komische Fehlermeldung in meinen Posts:

[COLOR=#333333][FONT=sans-serif]Warning: call_user_func() expects parameter 1 to be a valid callback, function 'rey_list_pings' not found or invalid function name in /www/htdocs/w00f9e61/html/blog/wp-includes/comment-template.php on line 1334[/FONT][/COLOR]
[COLOR=#333333][FONT=sans-serif]Warning: call_user_func() expects parameter 1 to be a valid callback, function 'rey_list_pings' not found or invalid function name in /www/htdocs/w00f9e61/html/blog/wp-includes/comment-template.php on line 1334

In der Linie ist:
[/FONT][/COLOR]

Zitat

call_user_func($args['callback'], $comment, $args, $depth);