[SOLVED] can't login anymore

[psygarden]

All of a sudden the login stopped working, now everything i try to loginto the ispCP admin panels, i get the login screen where i can enter the username and password, but then instead of the admin panels i get this error:

Quote: Duplicate entry 'yc6hvdEO25IIi7z183o2JlvgUy1' for key 1
Back

Powered by ispCP Omega

I can still login using phpmyadmin, email is working and sites are up and running... I get the same error when i enter an invalid password, or even when i enter an invalid username ?

greetings,
Rik