Boost not symlink files on VDS server

I am running my Drupal installation on a VDS server running Cent OS. Boost doesn't create the symlinks properly for some files. It looks like it is calculating the path wrong. I get two errors:

boost
Date Friday, December 14, 2007 - 02:28
User Anonymous
Location http://www.example.com/content/christmas_trees
Referrer http://www. example.com/category/forums/example-talk
Message Unable to create symlink: /var/www/vhosts/example.com/httpdocs/cache/www. example.com/0/content/christmas_trees.html to /var/www/vhosts/example.com/httpdocs/cache/www. example.com/0/node/1579

Notice the above seems to contain the correct path while the path below is incorrect. It is trying to create the symlink before the httpdocs directory.

php
Date Friday, December 14, 2007 - 02:28
User Anonymous
Location http://www. example.com/content/christmas_trees
Referrer http://www. example.com/category/forums/shenzhen-talk
Message symlink() [function.symlink]: open_basedir restriction in effect. File(/var/www/vhosts/example.com/node/1579.html) is not within the allowed path(s): (/var/www/vhosts/example.com/httpdocs:/tmp) in /var/www/vhosts/example.com/httpdocs/sites/all/modules/boost/boost.helpers.inc on line 83.