Unable to add payment method to your account.

I’m trying to add a payment method, but it’s not working correctly.
I’m getting the following error: https://drop.frontporchsolutions.com/i/5OCPOR and these errors in the console: https://drop.frontporchsolutions.com/i/SpjRId
I’m using the latest version of the plugin, 2.1.0.

The page I need help with: [log in to see the link]