Checkout error (I am missing a file I believe)

I am having a major error during checkout. When an item is added to the cart and I hit: checkout I am taken to a blank page. This is the URL (I have Simple SEO URL installed).

http://www.collars2switch.com/checkout_shipping

So I no longer go to the log in page which is where I used to go. I had FEC installed and never got it working right. I ran the uninstall and removed these files from my site (as per recommended (one at a time). But I noticed the orders.php file had to be replaced, so I replaced it with another.

What file would cause this to happen? How can I correct this? I was removing many files for the FEC add on so now I don't know what to do!!

Have you checked the error logs in /cache ?

stevesh:

Have you checked the error logs in /cache ?

Thank you stevesh. The logs kept saying: includes>classes>order.php

This file was replaced with the orginal, but I had also installed the edit orders.php. So I replaced with the orginal, then changes the code to reflect the edit orders. Works great now! I would have never though to look through the cache logs.

Removing FEC was a pain and some of the overwrittten files that were removed was the issue. Be careful all who remove this add on! (Great add on just don't remove it. Ha Ha)