[gelöst]Warnmeldung in Drupal 6.13

Ich erhalte in Drupal 6.13 folgende Warnmeldung. Meine Plattform lief in Drupal6.12 ohne diese Warnung:

user warning: Unbekanntes Tabellenfeld 'u.signature_format' in field
list query: SELECT c.cid as cid, c.pid, c.nid, c.subject, c.comment, c.format, c.timestamp, c.name, c.mail, c.homepage, u.uid, u.name AS registered_name, u.signature, u.signature_format, u.picture, u.data, c.thread, c.status FROM comments c INNER JOIN users u ON c.uid = u.uid WHERE c.nid = 21 ORDER BY c.thread DESC LIMIT 0, 50 in /html/modules/comment/comment.module on line 992.

Wer kann mir helfen?