code: def get_job_errors(self, job_id):
          
          try:
              return RawMantaClient.get_job_errors(self, job_id)
          except errors.MantaAPIError as ex:
              if ex.res.status != 404:
                  raise
              # Job was archived, try to retrieve the archived data.
              mpath = "/%s/jobs/%s/err.txt" % (self.account, job_id)
              content = self.get_object(mpath)
              return self._job_errors_from_content(content)
docs: GetJobErrors
              https://apidocs.joyent.com/manta/api.html#GetJobErrors
          with the added sugar that it will retrieve the archived job if it has
          been archived, per:
              https://apidocs.joyent.com/manta/jobs-reference.html#job-completion-and-archival