AttributeError: 'crontab' object has no attribute 'human_seconds' about redisbeat HOT 2 CLOSED

def setup_schedule(self):
        # init entries
        self.merge_inplace(self.app.conf.CELERYBEAT_SCHEDULE)
        tasks = [jsonpickle.decode(entry) for entry in self.rdb.zrange(self.key, 0, -1)]
        linfo('Current schedule:\n' + '\n'.join(
              str('task: ' + entry.task + '; each: ' + entry.schedule.human_seconds)
              for entry in tasks))

def setup_schedule(self):
        # init entries
        self.merge_inplace(self.app.conf.CELERYBEAT_SCHEDULE)
        tasks = [jsonpickle.decode(entry) for entry in self.rdb.zrange(self.key, 0, -1)]
        linfo('Current schedule:\n' + '\n'.join(
              str('task: ' + entry.task + '; each: ' + repr(entry.schedule))
              for entry in tasks))