Can't "select payment" to pay for Audit Defense

I am almost done with my tax and am at Review/Audit Protection phase.

I WANT to buy the Audit Protection and I want pay the fee with my credit card. (Because I won't have any refund, that's the only option).

 

But when I click "Charge My Credit Card" button in "How would you like to pay for Audit Defense?", it immediately shows an error screen that says: 

 

We noticed your payment didn't go through. Select Continue to select payment method. You will have the option to choose credit card again.

 

This is very strange because I wasn't given any opportunity to enter my credit card information. When I select "Continue", it just show the "How would you like to pay..." screen. 

 

I'm in the indefinite loop. How can this situation be fixed? 

 

I am using the desk top version, so I cannot clear the cache, as suggested to a similar question for the web version.