newsyslog.conf syntax 5.1-RELEASE

[Redmond Militante]

hi all

i'm getting the following message from the cron daemon on a 5.1-RELEASE box.

newsyslog: malformed at:
/var/log/firewall_logs			600  14    *    $DO   Z

i've been trying to set up newsyslog so that it archives my firewall logs every night at midnight.  can anyone tell me what's wrong with my syntax on this line?

thanks
redmond
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