Log error when job does not exist

        self.jobs[job_id].stop()

    def remove(self, job_id):

        try:

            return self.jobs.pop(job_id)

        except KeyError:

            logger.error('Job %s does not exist', job_id)

    def create(self, job_constructor, *args, **kwargs):

        """Create a new job and populate job id."""