爬虫Scrapy框架项目运行时报错！求解决！

E:JetBrainsPyCharmmySpider>scrapy crawl itcast -o itcast.json
2018-03-26 14:50:23 [scrapy.utils.log] INFO: Scrapy 1.5.0 started (bot: mySpider)
2018-03-26 14:50:23 [scrapy.utils.log] INFO: Versions: lxml 4.2.1.0, libxml2 2.9.5, cssselect 1.0.3, parsel 1.4.0, w3lib
 1.19.0, Twisted 17.9.0, Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit (AMD64)], pyOpenSSL 17.
5.0 (OpenSSL 1.1.0g  2 Nov 2017), cryptography 2.2.1, Platform Windows-10-10.0.16299-SP0
2018-03-26 14:50:23 [scrapy.crawler] INFO: Overridden settings: {'BOT_NAME': 'mySpider', 'FEED_FORMAT': 'json', 'FEED_UR
I': 'itcast.json', 'NEWSPIDER_MODULE': 'mySpider.spiders', 'SPIDER_MODULES': ['mySpider.spiders']}
2018-03-26 14:50:23 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.feedexport.FeedExporter',
 'scrapy.extensions.logstats.LogStats']
2018-03-26 14:50:23 [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.re

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