Everytime I change a user to admin get an error message and can't use forum;

[-su-]

I'm sorry, but you can't use this board until the administrator fixes the problem.

This even happens in admin panel. What can I do to fix this?

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Nevermind I figured it out:
MyProtection (1.5)
This plugin enhances your forum security and prevents data loss.
Created by Pirata Nervo

It prevents any more staff members from being added and is annoying. Deactivated, see ya