错误信息：

2019-12-24 19:17:20 [twisted] CRITICAL: 
Traceback (most recent call last):
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\twisted\internet\task.py", line 517, in _oneWorkUnit
    result = next(self._iterator)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy\utils\defer.py", line 63, in <genexpr>
    work = (callable(elem, *args, **named) for elem in iterable)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy\core\scraper.py", line 184, in _process_spidermw_output
    self.crawler.engine.crawl(request=output, spider=spider)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy\core\engine.py", line 210, in crawl
    self.schedule(request, spider)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy\core\engine.py", line 216, in schedule
    if not self.slot.scheduler.enqueue_request(request):
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy_redis\scheduler.py", line 167, in enqueue_request
    self.queue.push(request)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy_redis\queue.py", line 99, in push
    data = self._encode_request(request)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy_redis\queue.py", line 43, in _encode_request
    return self.serializer.dumps(obj)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\scrapy_redis\picklecompat.py", line 14, in dumps
    return pickle.dumps(obj, protocol=-1)
  File "C:\Users\Tommy\Envs\py36x64\lib\site-packages\parsel\selector.py", line 204, in __getstate__
    raise TypeError("can't pickle Selector objects")
TypeError: can't pickle Selector objects

请问老师知道这个怎么解决吗，我搜了好久没搜到，谢谢老师