我按照老师新增的爬虫内容加进去，运行出错。怎么破？

/Users/kouurei/venv/bin/python /Users/kouurei/PycharmProjects/spider/csdn_spider/spider.py
/Users/kouurei/venv/lib/python3.7/site-packages/pymysql/cursors.py:170: Warning: (1292, “Truncated incorrect DOUBLE value: ’ '”)
result = self._query(query)
Traceback (most recent call last):
File “/Users/kouurei/PycharmProjects/spider/csdn_spider/spider.py”, line 214, in
parse_list(url)
File “/Users/kouurei/PycharmProjects/spider/csdn_spider/spider.py”, line 191, in parse_list
parse_topic(topic_url)
File “/Users/kouurei/PycharmProjects/spider/csdn_spider/spider.py”, line 67, in parse_topic
topic_item = all_divs[0]
File “/Users/kouurei/venv/lib/python3.7/site-packages/parsel/selector.py”, line 61, in getitem
o = super(SelectorList, self).getitem(pos)
IndexError: list index out of range