[Dovecot] pgsql-dovecot auth problem

[Ewald Geschwinde]

Jan 28 13:55:48 bachata dovecot-auth: PGSQL: Query "SELECT password FROM 
users WHERE userid = 'foo at foo.bar'" failed:

I have this error in /var/log/mail.log

I have installed a debian machine with dovecot debian packages
in my test environment it runs perfect

I have used the tutorials on wiki.dovecot.org
And there is nothing in the postgresql log about this query
And I'm logging queries

HAs anyone encountered this error?

Postfix send the mail in the right maildir
Only the IMAP login does not work.

Regards Ewald Geschwinde