Unknown column 'u.signature_format' ...comment/comment.module on line 992.

I'm using Drupal 6.20. Running the status report says that modules, themes and database are all up to date. Yet I still get the error below saying that the u.signature_format column is unknown when running queries in the comment.module. The comment.module is v 1.617.2.17 2010/08/1 and system version is 6055.

bob kraut

user warning: Unknown column '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 = 5 ORDER BY c.thread DESC LIMIT 0, 50 in /home1/templesi/public_html/drupal/modules/comment/comment.module on line 992.

Me too.

Drupal 6.20
All Modules up to date.
update.php done.
signatures and user pictures are disabled.

user warning: Unknown column '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 = 34 ORDER BY c.thread DESC LIMIT 0, 10 in /home1/ :) /public_html/ :) /modules/comment/comment.module on line 992.

Help Please. Thank you.

Found the solution here.
http://drupal.org/node/508666#comment-1783504

phpMyAdmin
alter table: users
add column = signature_format
smallint
not null
default 0