dovecot - May 2010 - v2.0.beta4: Couldn't drop privileges: Unknown mail_privileged_group

Hi,

latest HG throws this error:

May  8 06:42:33 spectre dovecot: master: Dovecot v2.0.beta4 (0a35407e6ff4)
starting up

May  8 06:48:01 spectre dovecot: imap(alias at domain.tld): Error: user alias at
domain.tld: Couldn't drop privileges: Unknown mail_privileged_group: 5000
May  8 06:48:01 spectre dovecot: imap(alias at domain.tld): Error: Internal
error occurred. Refer to server log for more information.

Regards
Thomas