cannot start postfix

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http://askubuntu.com – I am having issues starting postfix. I have configured postfix several times now and cannot get it to stay started. Here is my main.cf: smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append_dot_mydomain = no readme_directory = no smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt smtpd_tls_key_file = /etc/ssl/private/smtpd.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache myhostname = slayton.webhop.net alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases (HowTos)