Could not determine root directory. This is bad.

Site:
Am I Cron: CRON_JOB
Host: affiliate.privatebox.co.nz
Self: /mailplans.php
Current dir: /var/www/vhosts/privatebox.co.nz/httpdocs
Filename:
DIR_DEV: c:/webspace/privatebox/html/
Warning: fopen(DIRgeo/GeoIP.dat) [function.fopen]: failed to open stream: No such file or directory in /var/www/vhosts/privatebox.co.nz/httpdocs/geo/geoip.inc on line 343
Can not open DIRgeo/GeoIP.dat