How to correct "Payment error Whoops! We hit a snag loading your data. Please try again". My Order Summary is $0 and yet I see this error. Unable to proceed. How to fix?

I am using Free edition and both Federal and State filing charges are $0. When I click on 'Confirm payment' I get this payment error. I have tried signing out and in multiple times, clearing browser cache, and using a new device and I still see the same error.