ZenCart Module not able to configure

I've got the ZenCart module installed on my server and I'm trying to configure it. The files are in a folder called 'store'. So for the Path to Zen Cart directory text field I type in './store' minus the quotation marks, of course. What I get back is a message saying 'One or more of the integration files are missing from your Zen Cart directory.' but no idea what file that may be. And are they talking about the ZenCart module for Gallery or ZenCart itself?

Gallery version (not just "2"): 2.2.5
PHP version (e.g. 5.1.6): 5.2.2
PHPInfo Link (see FAQ): http://www.bordwayphotography.com/gallery/phpinfo.php
Database (e.g. MySql 5.0.32): MySQL 5.0.45
Activated toolkits (e.g. NetPbm, GD): GD, ImageMagick, NetPBM
Operating system (e.g. Linux):Linux
Browser (e.g. Firefox 2.0): Firefox 3.1 beta 3