[Dovecot] Login process died too early - shutting down

Hi I installed dovecot-1.0.rc6.tar.gz on Fedora - 5 (i86) with MySQL - 5.0.24 to authenticate pop3 & imap requests. But dovecot doesn't start properly. I got below error from error log Error: Login process died too early - shutting down Error: Child 2521 (login) killed with signal 11 Please help me to sort out this problem as early as possible.

Regards, Bilal Ahmed