This Error Code 10201 is external error means error code does not Comes from PayPal end. But, Billing or transaction agreement canceled that's reason of error code.
Your Customer or clients had cancelled your Bill, invoice or transaction that's why you get this Error. Sometimes, after long time, if your customer does not accept payment. That will also be the reason, of this PayPal Error Code 10201 occurrence.
By opting 3 below steps you able to solve your problem (10201 PayPal error code).
Contact and inform your Customer (client) that billing agreement is somehow cancelled.
Delete your previous Agreement, that is cancelled
Create a New Billing Agreement with PayPal Express Checkout, that will directly send to your Customer.
Hope above 3 Steps able to solve your PayPal Error Code 10201 and you will able to get payment from your Customer (clients).
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