Category / Products not displayed in admin section

I am using the latest version of Z.cart. I recently uploaded image handler Vs 2 to my site, but then had to remove the files because when I would go to (admin, Catalog, Categories/Products) The screen did not show any of the categories or products. I thought after I removed the files from the image handler upload that would fix the problem, but it has not. I checked the cache for the error codes and this is what I found in the myDEBUG-adm file:

[13-Apr-2011 11:18:42] PHP Warning: require(includes/modules/category_product_listing.php) [<a href='function.require'>function.require</a>]: failed to open stream: No such file or directory in /home/content/s/c/o/scot4989/html/zencart/adminurrhtcqq/categories.php on line 645
[13-Apr-2011 11:18:42] PHP Fatal error: require() [<a href='function.require'>function.require</a>]: Failed opening required 'includes/modules/category_product_listing.php' (include_path='.:/usr/local/php5/lib/php') in /home/content/s/c/o/scot4989/html/zencart/adminurrhtcqq/categories.php on line 645

Can anyone help? Thank you!