Stripe Error

I get the following error when testing a valid card:

Fatal error: Uncaught exception 'Stripe_InvalidRequestError' with message 'No upcoming invoice for customer: cus_n0OhRW4mQPmOUs' in /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe/ApiRequestor.php:66 Stack trace: #0 /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe/ApiRequestor.php(114): Stripe_ApiRequestor->handleApiError('{? "error": {?...', 404, Array) #1 /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe/ApiRequestor.php(54): Stripe_ApiRequestor->_interpretResponse('{? "error": {?...', 404) #2 /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe/Invoice.php(27): Stripe_ApiRequestor->request('get', '/invoices/upcom...', Array) #3 /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-cont in /nfs/c10/h02/mnt/145118/domains/pictalo.com/html/wp-content/plugins/pro-sites/pro-sites-files/gateways/gateway-stripe-files/lib/Stripe/ApiRequestor.php on line 66