dovecot error 2

 dovecot -n
# 2.0.9: /etc/dovecot/dovecot.conf
doveconf: Warning: NOTE: You can get a new clean config file with: doveconf -n > dovecot-new.conf
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:85: add auth_ prefix to all settings inside auth {} and remove the auth {} section completely
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:87: passdb pam {} has been replaced by passdb { driver=pam }
doveconf: Warning: Obsolete setting in /etc/dovecot/dovecot.conf:89: userdb passwd {} has been replaced by userdb { driver=passwd }
# OS: Linux 2.6.32-220.13.1.el6.i686 i686 CentOS release 6.2 (Final)
auth_mechanisms = plain login
base_dir = /var/run/dovecot/
listen = *
login_greeting = Datavalet ready.
passdb {
  driver = pam
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
}
userdb {
  driver = passwd
}
doveconf: Error: ssl enabled, but ssl_cert not set
doveconf: Fatal: Error in configuration file /etc/dovecot/dovecot.conf: ssl enabled, but ssl_cert not set