[Dovecot] migrating to 1.0.rc1 + vpopmail

[Lucas Valdeón]

 Hi,

  We want to migrate to rc1 using vpopmail auth. This is the configuration:
--------------------------------------------------
auth default {
  # Space separated list of wanted authentication mechanisms:
  #   plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi
  mechanisms = plain login
  passdb vpopmail {
    # [cache_key=<key>] - See cache_key in PAM for explanation.
    #args =
  }
  userdb vpopmail {
  }
user = root
}
--------------------------------------------------

And the log shows:
--------------------------------------------------
dovecot: Jul 04 13:49:33 Error: Login process died too early - shutting down
dovecot: Jul 04 15:51:03 Info: Dovecot v1.0.rc1 starting up
dovecot: Jul 04 15:51:04 Error: auth(default): dovecot-auth: Fatal:
USERDB envir
onment is unset
dovecot: Jul 04 15:51:04 Error: Auth process died too early - shutting down
dovecot: Jul 04 15:51:04 Error: child 11290 (auth) returned error 89
dovecot: Jul 04 15:55:42 Info: Dovecot v1.0.rc1 starting up
dovecot: Jul 04 15:55:43 Error: login: Protocol version mismatch (mixed
old and
new binaries?)
dovecot: Jul 04 15:55:43 Error: Login process died too early - shutting down
--------------------------------------------------

 What´s happening?

 Thank you in advance,
  Lucas