I'm getting this error independent on a number of different configs. (For example, received it on lodash and chef).
TypeError: expected string or buffer
https://docs.chef.io/nodes.html
2015-12-31 15:48:04 [scrapy] ERROR: Spider error processing <GET https://docs.chef.io/nodes.html> (referer: https://docs.chef.io/)
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/scrapy/utils/defer.py", line 102, in iter_errback
yield next(it)
File "/usr/local/lib/python2.7/site-packages/scrapy/spidermiddlewares/offsite.py", line 28, in process_spider_output
for x in result:
File "/usr/local/lib/python2.7/site-packages/scrapy/spidermiddlewares/referer.py", line 22, in <genexpr>
return (_set_referer(r) for r in result or ())
File "/usr/local/lib/python2.7/site-packages/scrapy/spidermiddlewares/urllength.py", line 37, in <genexpr>
return (r for r in result or () if _filter(r))
File "/usr/local/lib/python2.7/site-packages/scrapy/spidermiddlewares/depth.py", line 54, in <genexpr>
return (r for r in result or () if _filter(r))
File "/usr/local/lib/python2.7/site-packages/scrapy/spiders/crawl.py", line 67, in _parse_response
cb_res = callback(response, **cb_kwargs) or ()
File "/Users/dustin/Documents/code/documentation-scrapper/src/documentation_spider.py", line 51, in callback
records = self.strategy.get_records_from_response(response)
File "/Users/dustin/Documents/code/documentation-scrapper/src/strategies/default_strategy.py", line 26, in get_records_from_response
records = self.get_records_from_dom()
File "/Users/dustin/Documents/code/documentation-scrapper/src/strategies/default_strategy.py", line 51, in get_records_from_dom
nodes_per_level[level] = self.cssselect(level_selector)
File "/Users/dustin/Documents/code/documentation-scrapper/src/strategies/abstract_strategy.py", line 84, in cssselect
return CSSSelector(selector)(self.dom)
File "/usr/local/lib/python2.7/site-packages/lxml/cssselect.py", line 94, in __init__
path = translator.css_to_xpath(css)
File "/usr/local/lib/python2.7/site-packages/cssselect/xpath.py", line 192, in css_to_xpath
for selector in parse(css))
File "/usr/local/lib/python2.7/site-packages/cssselect/parser.py", line 341, in parse
match = _el_re.match(css)
TypeError: expected string or buffer