How to fix error code 400000?

99 server response: the remove server returned an error:(500) Internal Server Error

API Response

Code 400000 

Message There was a problem with the request. Please see "detail" for more.

Info: "https://developer.sagepayments.com/docs/errors#400000.

Detail: "Processing Error" : An error occurred on our system while processing this request. Please contact our developer support team.

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