Error: "incorrecly formatted jws payload"

I am able to complete a payment in sandbox test mode.

However when I turn on live mode, customers get a payment error saying “incorrecly formatted JWS payload” (typo included)

I have searched online and many people have this problem but don’t ever get a response. I can’t even figure out what this means.

I just updated to the lastest version of WooCommerce last night and it forced me to update to the new version of the SimplifyCommerce plugin too. (1.0.2)

I am on PHP 5.6 – It happens on 5.4 too. (I upgraded and the problem still exists)

I *Really REALLY * want to use Simplify Commerce, but at this point, I might have to launch my website with Paypal. 🙁

Anyone have any ideas?

https://wordpress.org/plugins/woocommerce-gateway-simplify-commerce/