Error when trying to complete purchase.

I'm testing this site on my server and I thought all I had left to do was add in the return/error/cancel URLs on the pp_advanced.php page and it would be good to go. An item goes into the shopping cart then moves to the checkout page and when I hit continue I get the following error:
Some required information is missing or incorrect. Please correct the fields below and try again.
Error: Field Format Error: Invalid URL. Please return to the website from where you started your purchase and try again.

Any ideas? I can provide access to the site URL or copies of any code/page as needed.
Thanks.

Yes, I'd need to see the page to debug it. If you want to send a url where I can reproduce the problem and FTP information in the private area of a reply to this post I'll take a look.

And ready for review. My internet connection is so slow I had to pull all the files together and upload them from a different location. GRRR!

It appears there are some missing javascript files on the page currently.... very cool site and art work. If you post your phone number in the private area of a reply to this thread I'll give you a call and look into it with you directly.

I assume this was built with the latest BETA of eCart... it should be functional, so I'm interested to see why it didn't work and will gladly look into it with you.

I'm not sure how something went missing but hoping that once you go through it we can find them. Would so love to have this up and running today!

We fixed this by running the checkout wizard with the latest eCart 6 beta with Paypal Advanced.