Error to upgrade zoom account

[hal-adm]

I am going to upgrade my zoom account from Basic to Pro but while doing the same getting the following error:

"Cannot invoke "com.zuora.api.axis2.ZuoraServiceStub$PaymentMethod.getMandateID()" because "dfPaymentMethod" is null (-1)"

Can anybody advise, how can the above issue be resolved?

[Rupert]

Hi @hal-adm 

Strange. I would try again. Maybe from a different browser, or maybe after clearing your cache. 

What region are you in?