Could not determine root directory. This is bad.

Site:
Am I Cron: CRON_JOB
Host: affiliate.privatebox.co.nz
Self: /member/signup.php
Current dir: /var/www/vhosts/privatebox.co.nz/httpdocs/member
Filename:
DIR_DEV: c:/webspace/privatebox/html/
Warning: require_once(DIRmember/db/db_conn.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/vhosts/privatebox.co.nz/httpdocs/member/functions.php on line 3

Fatal error: require_once() [function.require]: Failed opening required 'DIRmember/db/db_conn.php' (include_path='.:/usr/share/php:/var/www/vhosts/common') in /var/www/vhosts/privatebox.co.nz/httpdocs/member/functions.php on line 3