How to remove this hack?
 

I believe this is from https://vborg.vbsupport.ru/showthread.php?t=231666. But the author is no longer supporting the mod. I uninstalled this mod quite a while ago...but I'm still getting sql errors:

Database error in vBulletin 4.0.7:

Invalid SQL:

SELECT userid, usergroupid, displaygroupid, username, posts, post_thanks_thanked_times
FROM user AS user
WHERE post_thanks_thanked_times > '0'
ORDER BY post_thanks_thanked_times DESC
LIMIT 0, 15;

MySQL Error : Unknown column 'post_thanks_thanked_times' in 'field list'
Error Number : 1054
Request Date : Wednesday, October 6th 2010 @ 08:55:45 PM
Error Date : Wednesday, October 6th 2010 @ 08:55:45 PM
Script : http://www.onlinedebate.net/forums/forum.php
Referrer : http://www.onlinedebate.net/forums/s...e=2&styleid=54
IP Address : xxxx
Username : xxxx
Classname : vB_Database
MySQL Version :

I have access to phpmyadmin...but I don't see how to remove the leftovers in the db for this hack to resolve the above error that occurs on occasion.

Delete the files off the server from the mod also

Already did that.

You didn't uninstall it completely. Read the install instructions and do everything backwards.

How do I delete the mod server side?

I have no access to my forum

It isn't necessarily a plugin that is causing the issue. Did you go through the instructions backwards?