Squirrelmail/dovecot authentication error
 

I have this error on squirrelmail when i try to login incorrect username or password when i go to my log files am using fedora 8 i get this error on attempt to login:

dovecot: auth(default): digest-md5(xxxxx@xxxxx,127.0.0.1): passdb credentials' length is wrong

my smtp server is Postfix.

anyone who can help?

thanks