user warning: Unknow Column

user warning: Unknown column 'a.lastfetch' in 'where clause' query: SELECT a.uid, a.userid, a.password, a.feed, a.module FROM drup_activitystream_accounts a LEFT JOIN drup_users u on a.uid = u.uid WHERE a.lastfetch < date_sub(now( ) , INTERVAL 1 HOUR) AND u.access > unix_timestamp(date_sub(now( ) , INTERVAL 30 day)) ORDER BY a.lastfetch DESC, u.access DESC in /home2/[directory]/public_html/modules/activitystream/activitystream.module on line 472.

I have recently been seeing this error, but can't seem to track down where it is coming from. Anybody have any ideas. Since it started throwing this error it has not updated any activity stream. I am using drupal 6.19.