code: def evaluate_report(report):
          
          if report["valid"]:
              return
          for warn in report["warnings"]:
              LOGGER.warning(warn)
          # We only ever test one table at a time.
          for err in report["tables"][0]["errors"]:
              LOGGER.error(err["message"])
          raise ValueError("Invalid data file. Please see errors above.")
docs: Iterate over validation errors.