PayPal "Error Detected" - shopping cart is empty
I have made several carts using eCart and PayPal as my main checkout gateway. The site is live (softdipes.com) and I am getting the following error when I try to checkout.
Your shopping cart is empty
The order is being stored in the database but PayPal seems to not be getting any data. Any ideas?
P.S. I included a zip of most of my website. I would upload the whole website, but can't due to the file size limit.
Hope I included in the zip, everything you need to see help me with my problem.