phpthumb trailing slash error - how to fix?

[2012-02-09 18:44:52] (ERROR @ /var/www/vhosts/entertainmentrevue.com/httpdocs/core/model/phpthumb/phpthumb.class.php : 1054) PHP warning: is_link() [<a href='function.is-link'>function.is-link</a>]: open_basedir restriction in effect. File(/var/www/vhosts/entertainmentrevue.com/httpdocsassets/images/content/scholarship-003.jpg) is not within the allowed path(s): (/tmp:/var/www/vhosts/entertainmentrevue.com/httpdocs)
[\code]

The correct path is: /httpdocs/assets/

I have the resource path set in the manager, with the trailing slash ..

open_basedir setup is correct... 

how do I fix these errors?

-sean