Thanks for the tip, but that did not work. All I got was a blank page after clicking on checkout. Your comment did help me though.
you don't have funds in your PayPal account and don't have a credit card on file to do the funding,
stupid me - my paypal account does not have a card on it and even though paypal seemed to take the payment, it threw an error. Is there a more expressive error message that's available?