plugin error

[Jeordie015]

I'm getting this error when installing or uninstalling a plugin. This started happening all of a sudden. I've tried disabling all plugins and reinstalling all the vB files.

Fatal error: Cannot instantiate non-existent class: vb_database_alter_mysql in /home/content/a/w/e/awesomebbs/html/admincp/plugin.php on line 1387

The line number in the error isn't always the same, but other than that, it's the same message. Any suggestions?

UPDATE: I might have solved that problem, but now for the v3 Arcade hack, I'm getting this error when changing the usergroup permissions for the arcade in the usergroup manager. This might be part of the same problem. I don't know.

MySQL Error : Unknown column 'arcadepermissions' in 'field list'
Error Number : 1054
Date : Sunday, May 7th 2006 @ 08:19:19 AM
Script : http://www.theawesomebbs.com/admincp/usergroup.php
Referrer : http://www.theawesomebbs.com/admincp...&usergroupid=5
IP Address : 12.201.47.175
Username : BB3K
Classname : vb_database

[Zachery]

What plugin are you installing?
What version of MySQL are you running
What version of PHP are you using?