Spam module stopped working with "Missing argument 2 for custom_spam_operations()" and "Unknown column" PHP errors

Hi,
My PHP log was showing PHP errors that had to so with the spam module. I tries to follow the instructions here.
Now I get two other errors in my log (below), and spam module is not working at all. I tried to disable the spam module, uninstall it and reinstall it and the issue persists.
Error 1 (with my user name):

Missing argument 2 for custom_spam_operations() in /home/mysitename/drupal_data/common/sites/all/modules/spam/filters/custom/custom.module on line 441.

Error 2 (by Anonymous):

Unknown column 'extra' in 'field list' query: SELECT cid, filter, style, status, scan, extra FROM spam_custom WHERE status != 0 ORDER BY weight ASC in /home/mysitename/drupal-5.7/includes/database.mysql.inc on line 172.

I'll appreciate any help.
Thaks