Blank Page after clicking Add To Cart

Hi. So I tried installing the Guest Checkout Mod COWOA and I just couldn't get it to work. I tried to unistal it but got an error running the unistal. Not a problem, I just uploaded my backup of the database! I had made a backup of all the zencart files as well and reuploaded those pre-COWOA files.

STILL, when I click Add TO Cart I just get a blank page. the Error logs reads [24-Nov-2012 15:48:14] PHP Warning: Missing boundary in multipart/form-data POST data in Unknown on line 0

http://www.foursevenfive.com/index.php?main_page=shopping_cart&product_id=319

Any IDEAS???

ZenCart V. 1.39h

Sorry. It's when I click teh Checkout button.

Sorry to keep replying to my own post. I finally found the error but I don't know what to do about it. Something to do with Recaptcha with I hadn't even messed with.

[15-Nov-2013 17:12:07] PHP Fatal error: Cannot redeclare _recaptcha_qsencode() (previously declared in /home2/phc475/public_html/includes/classes/recaptchalib.php:49) in /home2/phc475/public_html/includes/classes/recaptchalib.php on line 57