session.save_path variable not set

When I attempt to access out bitweaver site (http://www.bendigo-orienteers.com.au/bitweaver/wiki/) I get the following error message;

Warning: tempnam() function.tempnam: open_basedir restriction in effect. File() is not within the allowed path(s): (/home/bendigoo:/usr/lib/php:/usr/local/lib/php:/tmp) in /home/bendigoo/public_html/bitweaver/kernel/preflight_inc.php on line 24
bitweaver is not properly set up:

The session.save_path variable is not setup correctly (its empty).

Proceed to the installer at /bitweaver/install/install.php after you run the command.
Consult the bitweaverTechnical Documentation if you need more help.

What is going on?
How can I correct the issue?

Thanks in advance