File "/usr/local/lib/python2.7/site-packages/scrapy/commands/crawl.py", line 57, in run
	    self.crawler_process.crawl(spname, **opts.spargs)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 163, in crawl
	    return self._crawl(crawler, *args, **kwargs)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 167, in _crawl
	    d = crawler.crawl(*args, **kwargs)
	  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1274, in unwindGenerator
	    return _inlineCallbacks(None, gen, Deferred())
	--- <exception caught here> ---
	  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
	    result = g.send(result)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 90, in crawl
	    six.reraise(*exc_info)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 72, in crawl
	    self.engine = self._create_engine()
	  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 97, in _create_engine
	    return ExecutionEngine(self, lambda _: self.stop())
	  File "/usr/local/lib/python2.7/site-packages/scrapy/core/engine.py", line 70, in __init__
	    self.scraper = Scraper(crawler)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/core/scraper.py", line 69, in __init__
	    self.spidermw = SpiderMiddlewareManager.from_crawler(crawler)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/middleware.py", line 58, in from_crawler
	    return cls.from_settings(crawler.settings, crawler)
	  File "/usr/local/lib/python2.7/site-packages/scrapy/middleware.py", line 36, in from_settings
	    mw = mwcls.from_crawler(crawler)
	  File "/usr/local/lib/python2.7/site-packages/scrapylib/deltafetch.py", line 60, in from_crawler
	    reset = s.getbool('DELTAFETCH_RESET')
	  File "/usr/local/lib/python2.7/site-packages/scrapy/settings/__init__.py", line 129, in getbool
	    return bool(int(self.get(name, default)))
	exceptions.ValueError: invalid literal for int() with base 10: 'true'