PayPal Pro and Stripe Failing

I've installed both PayPal Pro and Stripe but seem unable to process subscriptions.

This is what I get:
prntscr.com/dwdozu

Seems there is error with payment processing. Did you get the above error with PayPal or Stripe? The reason of the error seems not being displayed for some reasons, so I don't know what's the error yet. I guess we will have to modify code to make the error shown, then you test it again, see the error and we can check it further

Tuan

I'm testing the plugins over on my own website as that also has membership Pro installed, is on HTTPS and has good standing with both PayPal and Stripe.

Still the same issue though.