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contingency: VALIDATION_ERROR , while proceeding with Subscribe Button.

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contingency: VALIDATION_ERROR , while proceeding with Subscribe Button.

I am creating a subscription flow for a product plan. 
All the subscription process is done by REST APIs.
But at the time when i proceed to subscribe after clicking `Login to subscribe button`, i am facing an error at the redirected page

with message Things don't appear to be working at the moment. Please try again later.

page URL is : https://www.sandbox.paypal.com/webapps/billing/subscriptions?ba_token=BA-6RL60762NP651641S

In console it gives error:

  1. Request URL:
  2. Request Method:
    POST
  3. Status Code:
    400 Bad Request
with response : 

 

{"ack":"contingency","contingency":"VALIDATION_ERROR","meta":{"calc":"......","rlog":"......"},"server":"......."}​

What is the real problem here?