Could not create a Stripe customer in Prosites checkout

I was testing my Stripe checkout with Prosites to see if it works. I created a coupon in Prosites called "test" where there was a discount leaving only .05 cents for the first month subscription. When I tried to register for a new site using this test coupon, it told me "a Stripe customer could not be created."

Could this be because it won't take such a low amount for a subscription, or is there some other reason.

Could someone test this to see if you get the same error message?

I am granting access to my dashboard. The coupon is good until 9/10/16.

Thanks, Joe.