'{"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":"109c1248-959a-8155-c7aa-26456cf7d90d","errors":[{"field":"email_address","message":"This value should not be blank."}]}'