No module named dupefilter

[dwgeneral]

» python -V                                                                
Python 2.7.16

» pip -V 
pip 19.0.3 from /usr/local/lib/python2.7/site-packages/pip (python 2.7)

» scrapy version                                                         
Scrapy 1.6.0

» python wescraper/scraper.py account liriansu miawu > we.json

2019-04-30 11:48:46 [scrapy.utils.log] INFO: Scrapy 1.6.0 started (bot: scrapybot)
2019-04-30 11:48:46 [scrapy.utils.log] INFO: Versions: lxml 4.3.3.0, libxml2 2.9.9, cssselect 1.0.3, parsel 1.5.1, w3lib 1.20.0, Twisted 19.2.0, Python 2.7.16 (default, Mar  4 2019, 09:02:22) - [GCC 4.2.1 Compatible Apple LLVM 10.0.0 (clang-1000.11.45.5)], pyOpenSSL 19.0.0 (OpenSSL 1.1.1b  26 Feb 2019), cryptography 2.6.1, Platform Darwin-18.5.0-x86_64-i386-64bit
2019-04-30 11:48:46 [scrapy.crawler] INFO: Overridden settings: {'DUPEFILTER_CLASS': u'scrapy.dupefilter.BaseDupeFilter'}
2019-04-30 11:48:46 [scrapy.extensions.telnet] INFO: Telnet Password: 8f3a081b9790f48a
2019-04-30 11:48:46 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.memusage.MemoryUsage',
 'scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.corestats.CoreStats']
2019-04-30 11:48:46 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2019-04-30 11:48:46 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2019-04-30 11:48:46 [scrapy.middleware] INFO: Enabled item pipelines:
[u'__main__.WeScraper']
2019-04-30 11:48:46 [scrapy.core.engine] INFO: Spider opened
Unhandled error in Deferred:
2019-04-30 11:48:46 [twisted] CRITICAL: Unhandled error in Deferred:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 172, in crawl
    return self._crawl(crawler, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 176, in _crawl
    d = crawler.crawl(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1613, in unwindGenerator
    return _cancellableInlineCallbacks(gen)
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1529, in _cancellableInlineCallbacks
    _inlineCallbacks(None, g, status)
--- <exception caught here> ---
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
    result = g.send(result)
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 98, in crawl
    six.reraise(*exc_info)
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 82, in crawl
    yield self.engine.open_spider(self.spider, start_requests)
exceptions.ImportError: No module named dupefilter

2019-04-30 11:48:46 [twisted] CRITICAL:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1418, in _inlineCallbacks
    result = g.send(result)
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 98, in crawl
    six.reraise(*exc_info)
  File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 82, in crawl
    yield self.engine.open_spider(self.spider, start_requests)
ImportError: No module named dupefilter
------------------------------------------------------------