Scrapy脚本无法从eventbrite.com提取事件

我编写了一个爬行类来爬过eventbrite.com，获取厄本那-香槟地区事件的数据。但是我犯了这个错误。你能告诉我有什么错误吗？我是新来的刮痧，所以我把这个贴在这里。你能告诉我如何纠正这个错误吗

scrapy crawl eventbrite
2015-07-02 17:08:38 [scrapy] INFO: Scrapy 1.0.1 started (bot: tutorial)
2015-07-02 17:08:38 [scrapy] INFO: Optional features available: ssl, http11
2015-07-02 17:08:38 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'tutorial.spiders', 'SPIDER_MODULES': ['tutorial.spiders'], 'BOT_NAME': 'tutorial'}
2015-07-02 17:08:38 [py.warnings] WARNING: :0: UserWarning: You do not have a working installation of the service_identity module: 'No module named service_identity'.  Please install it from <https://pypi.python.org/pypi/service_identity> and make sure all of its dependencies are satisfied.  Without the service_identity module and a recent enough pyOpenSSL to support it, Twisted can perform only rudimentary TLS client hostname verification.  Many valid certificate/hostname mappings may be rejected.

2015-07-02 17:08:38 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2015-07-02 17:08:38 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-07-02 17:08:38 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-07-02 17:08:38 [scrapy] INFO: Enabled item pipelines: 
2015-07-02 17:08:38 [scrapy] INFO: Spider opened
2015-07-02 17:08:38 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-07-02 17:08:38 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
Error during info_callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 415, in dataReceived
    self._write(bytes)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 554, in _write
    sent = self._tlsConnection.send(toSend)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1270, in send
    result = _lib.SSL_write(self._ssl, buf, len(buf))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
--- <exception caught here> ---
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1055, in infoCallback
    return wrapped(connection, where, ret)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1157, in _identityVerifyingInfoCallback
    transport = connection.get_app_data()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
exceptions.AttributeError: 'NoneType' object has no attribute '_app_data'

2015-07-02 17:08:49 [twisted] CRITICAL: Error during info_callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 415, in dataReceived
    self._write(bytes)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 554, in _write
    sent = self._tlsConnection.send(toSend)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1270, in send
    result = _lib.SSL_write(self._ssl, buf, len(buf))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
--- <exception caught here> ---
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1055, in infoCallback
    return wrapped(connection, where, ret)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1157, in _identityVerifyingInfoCallback
    transport = connection.get_app_data()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
exceptions.AttributeError: 'NoneType' object has no attribute '_app_data'

From cffi callback <function infoCallback at 0x106e78a28>:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1059, in infoCallback
    connection.get_app_data().failVerification(f)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
AttributeError: 'NoneType' object has no attribute '_app_data'
Error during info_callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 415, in dataReceived
    self._write(bytes)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 554, in _write
    sent = self._tlsConnection.send(toSend)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1270, in send
    result = _lib.SSL_write(self._ssl, buf, len(buf))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
--- <exception caught here> ---
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1055, in infoCallback
    return wrapped(connection, where, ret)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1157, in _identityVerifyingInfoCallback
    transport = connection.get_app_data()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
exceptions.AttributeError: 'NoneType' object has no attribute '_app_data'

2015-07-02 17:08:49 [twisted] CRITICAL: Error during info_callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 415, in dataReceived
    self._write(bytes)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/protocols/tls.py", line 554, in _write
    sent = self._tlsConnection.send(toSend)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1270, in send
    result = _lib.SSL_write(self._ssl, buf, len(buf))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
--- <exception caught here> ---
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1055, in infoCallback
    return wrapped(connection, where, ret)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1157, in _identityVerifyingInfoCallback
    transport = connection.get_app_data()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
exceptions.AttributeError: 'NoneType' object has no attribute '_app_data'

From cffi callback <function infoCallback at 0x103b1c9b0>:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 926, in wrapper
    callback(Connection._reverse_mapping[ssl], where, return_code)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_sslverify.py", line 1059, in infoCallback
    connection.get_app_data().failVerification(f)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1589, in get_app_data
    return self._app_data
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/OpenSSL/SSL.py", line 1148, in __getattr__
    return getattr(self._socket, name)
AttributeError: 'NoneType' object has no attribute '_app_data'
2015-07-02 17:08:51 [scrapy] DEBUG: Crawled (200) <GET https://www.eventbrite.com/d/il--urbana/events/?crt=regular&sort=date> (referer: None)
2015-07-02 17:08:51 [scrapy] DEBUG: Crawled (200) <GET https://www.eventbrite.com/d/il--champaign/events/?crt=regular&sort=date> (referer: None)
2015-07-02 17:08:51 [scrapy] INFO: Closing spider (finished)
2015-07-02 17:08:51 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 519,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 55279,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2015, 7, 2, 11, 38, 51, 775192),
 'log_count/CRITICAL': 2,
 'log_count/DEBUG': 3,
 'log_count/INFO': 7,
 'log_count/WARNING': 1,
 'response_received_count': 2,
 'scheduler/dequeued': 2,
 'scheduler/dequeued/memory': 2,
 'scheduler/enqueued': 2,
 'scheduler/enqueued/memory': 2,
 'start_time': datetime.datetime(2015, 7, 2, 11, 38, 38, 972701)}
2015-07-02 17:08:51 [scrapy] INFO: Spider closed (finished) 

scrapy crawl eventbrite
2015-07-02 17:08:38[scrapy]信息：scrapy 1.0.1已启动（机器人：教程）
2015-07-02 17:08:38[scrapy]信息：可选功能：ssl、http11
2015-07-02 17:08:38[scrapy]信息：覆盖的设置：{'NEWSPIDER_模块'：'tutorial.SPIDER'，'SPIDER_模块'：['tutorial.SPIDER']，'BOT_NAME'：'tutorial'}
2015-07-02 17:08:38[py.warnings]警告：：0:userwarnings:您没有服务标识模块的正常安装：“没有名为服务标识的模块”。请从安装它，并确保满足其所有依赖项。如果没有service_标识模块和最近足够支持它的pyOpenSSL，Twisted只能执行基本的TLS客户端主机名验证。许多有效的证书/主机名映射可能被拒绝。
2015-07-02 17:08:38[scrapy]信息：启用的扩展：CloseSpider、TelnetConsole、LogStats、CoreStats、SpiderState
2015-07-02 17:08:38[scrapy]信息：启用的下载中间件：HttpAuthMiddleware、DownloadTimeoutMiddleware、UserAgentMiddleware、RetryMiddleware、DefaultHeadersMiddleware、MetaRefreshMiddleware、HttpCompressionMiddleware、RedirectMiddleware、Cookies Middleware、ChunkedTransferMiddleware、DownloadersStats
2015-07-02 17:08:38[scrapy]信息：启用的蜘蛛中间件：HttpErrorMiddleware、OffsiteMiddleware、RefererMiddleware、UrlLengthMiddleware、DepthMiddleware
2015-07-02 17:08:38[scrapy]信息：启用的项目管道：
2015-07-02 17:08:38[刮屑]信息：蜘蛛打开
2015-07-02 17:08:38[抓取]信息：抓取0页（0页/分钟），抓取0项（0项/分钟）
2015-07-02 17:08:38[scrapy]调试：Telnet控制台监听127.0.0.1:6023
信息回调期间出错
回溯（最近一次呼叫最后一次）：
dataReceived中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/protocols/tls.py”，第415行
自写入（字节）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/protocols/tls.py”，第554行，以书面形式
发送=自连接发送（toSend）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1270行，在send中
结果=_lib.SSL_write（self._SSL，buf，len（buf））
包装器中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第926行
回调（连接.\u反向\u映射[ssl]，其中，返回\u代码）
---  ---
infoCallback中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/internet/_sslverify.py”，第1055行
返回包装（连接，其中，ret）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_-sslverify.py”，第1157行，在_-identityverifyingfocalback中
传输=连接。获取应用程序数据（）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1589行，在get_app_数据中
返回自。\应用程序\数据
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1148行，位于__
返回getattr（self.\u套接字，名称）
exceptions.AttributeError:“非类型”对象没有属性“\u应用程序\u数据”
2015-07-02 17:08:49[twisted]严重：信息回调期间出错
回溯（最近一次呼叫最后一次）：
dataReceived中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/protocols/tls.py”，第415行
自写入（字节）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/protocols/tls.py”，第554行，以书面形式
发送=自连接发送（toSend）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1270行，在send中
结果=_lib.SSL_write（self._SSL，buf，len（buf））
包装器中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第926行
回调（连接.\u反向\u映射[ssl]，其中，返回\u代码）
---  ---
infoCallback中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/internet/_sslverify.py”，第1055行
返回包装（连接，其中，ret）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/_-sslverify.py”，第1157行，在_-identityverifyingfocalback中
传输=连接。获取应用程序数据（）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1589行，在get_app_数据中
返回自。\应用程序\数据
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1148行，位于__
返回getattr（self.\u套接字，名称）
exceptions.AttributeError:“非类型”对象没有属性“\u应用程序\u数据”
从cffi回调：
回溯（最近一次呼叫最后一次）：
包装器中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第926行
回调（连接.\u反向\u映射[ssl]，其中，返回\u代码）
infoCallback中的文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/twisted/internet/_sslverify.py”，第1059行
连接。获取应用程序数据（）。失败验证（f）
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1589行，在get_app_数据中
返回自。\应用程序\数据
文件“/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site packages/OpenSSL/SSL.py”，第1148行，位于__
返回getattr（self.\u套接字，名称）
AttributeError:“非类型”对象在