Error on install

When installing rc1, the following error occurs:

user warning: Unknown column 'inventory' in 'field list' query: SELECT chid, name, description, weight, inventory FROM ad_channel WHERE conid = 1 ORDER BY weight ASC in /var/www/sites/askthebeerguy.com/drupal-6.13/sites/all/modules/ad/channel/ad_channel.module on line 857.

There is no such column in the install script.