运行scrapy crawl douban_spider后报错

2019-05-31 20:40:43 [scrapy.utils.log] INFO: Scrapy 1.6.0 started (bot: douban)

2019-05-31 20:40:43 [scrapy.utils.log] INFO: Versions: lxml 4.3.2.0, libxml2 2.9.9, cssselect 1.0.3, parsel 1.5.1, w3lib 1.20.0, Twisted 19.2.0, Python 2.7.5 (default, Apr  9 2019, 14:30:50) - [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)], pyOpenSSL 0.13.1 (OpenSSL 1.0.1e-fips 11 Feb 2013), cryptography 1.7.2, Platform Linux-3.10.0-693.el7.x86_64-x86_64-with-centos-7.4.1708-Core

2019-05-31 20:40:43 [scrapy.crawler] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'douban.spiders', 'SPIDER_MODULES': ['douban.spiders'], 'ROBOTSTXT_OBEY': True, 'BOT_NAME': 'douban'}

Traceback (most recent call last):

  File "/usr/bin/scrapy", line 10, in <module>

    sys.exit(execute())

  File "/usr/lib64/python2.7/site-packages/scrapy/cmdline.py", line 150, in execute

    _run_print_help(parser, _run_command, cmd, args, opts)

  File "/usr/lib64/python2.7/site-packages/scrapy/cmdline.py", line 90, in _run_print_help

    func(*a, **kw)

  File "/usr/lib64/python2.7/site-packages/scrapy/cmdline.py", line 157, in _run_command

    cmd.run(args, opts)

  File "/usr/lib64/python2.7/site-packages/scrapy/commands/crawl.py", line 57, in run

    self.crawler_process.crawl(spname, **opts.spargs)

  File "/usr/lib64/python2.7/site-packages/scrapy/crawler.py", line 171, in crawl

    crawler = self.create_crawler(crawler_or_spidercls)

  File "/usr/lib64/python2.7/site-packages/scrapy/crawler.py", line 200, in create_crawler

    return self._create_crawler(crawler_or_spidercls)

  File "/usr/lib64/python2.7/site-packages/scrapy/crawler.py", line 205, in _create_crawler

    return Crawler(spidercls, self.settings)

  File "/usr/lib64/python2.7/site-packages/scrapy/crawler.py", line 55, in __init__

    self.extensions = ExtensionManager.from_crawler(self)

  File "/usr/lib64/python2.7/site-packages/scrapy/middleware.py", line 53, in from_crawler

    return cls.from_settings(crawler.settings, crawler)

  File "/usr/lib64/python2.7/site-packages/scrapy/middleware.py", line 34, in from_settings

    mwcls = load_object(clspath)

  File "/usr/lib64/python2.7/site-packages/scrapy/utils/misc.py", line 44, in load_object

    mod = import_module(module)

  File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in import_module

    __import__(name)

  File "/usr/lib64/python2.7/site-packages/scrapy/extensions/memusage.py", line 16, in <module>

    from scrapy.mail import MailSender

  File "/usr/lib64/python2.7/site-packages/scrapy/mail.py", line 25, in <module>

    from twisted.internet import defer, reactor, ssl

  File "/usr/lib64/python2.7/site-packages/twisted/internet/ssl.py", line 230, in <module>

    from twisted.internet._sslverify import (

  File "/usr/lib64/python2.7/site-packages/twisted/internet/_sslverify.py", line 14, in <module>

    from OpenSSL._util import lib as pyOpenSSLlib

ImportError: No module named _util

_util貌似不是一个模块？安装不了 该怎么解决呢