dovecot down

[perjes]

after upgrade DSM to 4.0-2198
my dovecot crached
write in log:

Apr 1 23:15:55 dovecot: Fatal: auth(default): Unknown passdb driver 'shadow-file' (typo, or Dovecot was built without support for it? Check with dovecot --build-options)
Apr 1 23:15:55 dovecot: Fatal: Auth process died too early - shutting down

reinstalling MailStation did not solve the problem
[Please control your language]!? google dont known