'{"type":"https://mailchimp.com/developer/marketing/docs/errors/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the \'errors\' array.","instance":"666a0560-0d7c-b604-15c9-251375d7e6a7","errors":[{"field":"email_address","message":"This value should not be blank."}]}'