I can send the link via PM to anyone who wants to see it, I dont want the search engines to pick up on my development site for my client's SEO purposes.

I've isolated the problem further, it happens on that page when I run the following lines of code:

define('WP_USE_THEMES', false);
require_once(dirname(__FILE__) . '/../blog/wp-blog-header.php');

This file does exist, if I change the file name the page will come up with the PHP error. Other pages include this page as well and dont crash, these lines are in a page that is included virtually everywhere. That is the only factor I could isolate.