PP_confirm is also used for express checkout. Are you getting the error when using the paypal express checkout button or the direct payment form?
There is only one place for the direct payment form the information appears and that is on the confirm page in the local checkout server behavior.
There are three places for express checkout. One on the checkout page and if it isn't corrected you won't ever get to the paypal site, and two on the pp_confirm page. One to get the user data from paypal and the second to confirm the order.
Depending on where in the process you are running into the error you should be able to find where the code needs to be updated.