Error About Google Vault API with python program

Question

Im using Google Vault API from the python program. Using method is [Method: matters.exports.create]

reference https://developers.google.com/vault/reference/rest/v1/matters.exports/create

Using python library is google-api-python-client. https://github.com/googleapis/google-api-python-client

result = service.matters().exports().get(matterId=matter_id, exportId=vault_extraction.export_id, alt='json').execute()

I executed that python program, and got an API error response. "<HttpError 400 Request contains an invalid argument>"

I'd like to know why i got the error, and how to resolve this error.

thanks.