How to correctly disable shipping and have shopping cart function?

Hi -

I'm using MarketPress to let people purchase an online class. Under store setting > shipping I have chosen "No Shipping".

When I start going through checkout I first have only e-mail under "shipping" (as expected) then Iget to stage three "Checkout" it's blank, and then trying to go to the next stage "Continue Checkout" I get the following error:

There was a problem connecting to PayPal to setup your purchase. Please try again.
10727 - Shipping Address1 Empty - The field Shipping Address1 is required
10728 - Shipping Address City Empty - The field Shipping Address City is required
10729 - Shipping Address State Empty - The field Shipping Address State is required
10730 - Shipping Address Postal Code Empty - The field Shipping Address Postal Code is required