Unable to login in roundcube

Hi all,
i have recently install CWP and it's a great work.

But i have a problem, i add a domain and an email account (in this order).
When i atempt to login to my mail account, Roundcube is loading, and redirect to login page.
I've created more mail account for test, but same problem.

Any ideas ?
Thanks !

(I'm a french user, sorry for my english)

try to restart dovecot service

# service dovecot restart