Error During Checkout on Delivery Method

I made the Company field required during registration, including registration during checkout. Now, when a customer has something in this field on their profile, there is an error once getting to Delivery Method at checkout. This error does not happen if I turn off Fedex shipping module.

I am not a coder and have never done any coding previously. I have barely taught myself enough to do what I have done and now have no idea on how to fix this. Any help is greatly appreciated.

Site:
http://impact60learning.com/sbu

Error:
Notice: Trying to get property of non-object in D:\Inetpub\impact60learning\sbu\catalog\model\shipping\fedex.php on line 270Notice: Trying to get property of non-object in D:\Inetpub\impact60learning\sbu\catalog\model\shipping\fedex.php on line 270
Fatal error: Call to a member function getElementsByTagName() on a non-object in D:\Inetpub\impact60learning\sbu\catalog\model\shipping\fedex.php on line 355