We have a few products that are marked as FREE SHIPPING. In the product info we have that Shipping Address is NOT required. A user goes through the process and does not enter their shipping address. however, when they click "PAY" they get back an error and their payment doesn't go through. We then get an e-mail saying that their shipping address is wrong. The e-mail comes from zencart. Here's the beginning of it:


ALERT: PayPal Direct Payment Error (10726 )
Dear store owner,
An error occurred when attempting to initiate the payment-validation transaction. As a courtesy, only the error "number" was shown to your customer. The details of the error are shown below.

10726
Invalid Data
There's an error with this transaction. Please enter a complete shipping address.10727
Invalid Data
There's an error with this transaction. Please enter an address1 in the shipping address.10728
Invalid Data
There's an error with this transaction. Please enter a city in the shipping address.

Zen Cart message: 10726 Invalid Data - There's an error with this transaction. Please enter a complete shipping address.


--------------

What is causing this and how can we fix?? This is rather urgent as payments are not going through for tickets to an event in the near future!!!! Thanks in advance! :-)