[Pro Sites] Stripe Error

Hi Support Team,

Currently we are using Paypal as the live payment gateway and added Stripe as the alternative payment gateway but set as test mode for our Prosite. The stripe account is newly created which uses the latest stripe API version. We also uploaded the gateway-stripe.php fix as mentioned in this instruction https://premium.wpmudev.org/forums/topic/pro-site-test-payment-not-processing#post-1308480 and re-saved the Levels which successfully created the plans in Stripe. However, after submitting the credit card form, prosite only creates the user account, but no website was created. It just shows the same pro-site page with the pricing plan table but the title has been changed to "Change your plan", which indicates that I am logged-in. Also, there's an error in the payment gateway - https://www.screencast.com/t/aWyX80wj0. What could be the problem and how to fix this?