How to configure Mailgraph on FreeBSD Box

HI,

I have configured  7.0-RELEASE FreeBSD 7.0-RELEASE box.
Installed postfix.
Now I installed mailgraph.But I didnt get mailgraph only

There's a two file called "mailgraph.rrd" and "/var/db/mailgraph/mailgraph_virus.rrd" not exist.
I attached http-error log below.

130.3/cgi-bin/mailgraph.cgi
[Fri May 02 11:12:22 2008] [error] [client 192.168.130.34] Premature end of script headers: mailgraph.cgi, referer: http://192.168.130.3/cgi-bin/mailgraph.cgi
[Fri May 02 11:12:22 2008] [error] [client 192.168.130.34] ERROR: opening '/var/db/mailgraph/mailgraph.rrd': No such file or directory, referer: http://192.168.130.3/cgi-bin/mailgraph.cgi
[Fri May 02 11:12:22 2008] [error] [client 192.168.130.34] Premature end of script headers: mailgraph.cgi, referer: http://192.168.130.3/cgi-bin/mailgraph.cgi