attributeerror found

[brucedong2016]

When I use the example linkgenerator or definde a new spider,there are the same error messages.Please help me,is there any files that need re-config?Thanks

2017-06-25 07:33:44 [scrapy.utils.signal] ERROR: Error caught on signal handler: <bound method ?.spider_closed of <AdminDemo1Spider 'admin_demo1' at 0x1117ed890>>
Traceback (most recent call last):
  File "/Users/Bruce/git/Distributed-Multi-User-Scrapy-System-with-a-Web-UI/venv/lib/python2.7/site-packages/twisted/internet/defer.py", line 150, in maybeDeferred
    result = f(*args, **kw)
  File "/Users/Bruce/git/Distributed-Multi-User-Scrapy-System-with-a-Web-UI/venv/lib/python2.7/site-packages/pydispatch/robustapply.py", line 55, in robustApply
    return receiver(*arguments, **named)
  File "/private/var/folders/fx/jgdx72z90b5dsq_l39v1q00m0000gn/T/admin_demo1-2-sl3cQm.egg/admin_demo1/spiders/admin_demo1.py", line 28, in spider_closed
AttributeError: 'AdminDemo1Spider' object has no attribute 'statstask'
2017-06-25 07:33:44 [twisted] CRITICAL: Unhandled error in Deferred:
2017-06-25 07:33:44 [twisted] CRITICAL: 
Traceback (most recent call last):
  File "/Users/Bruce/git/Distributed-Multi-User-Scrapy-System-with-a-Web-UI/venv/lib/python2.7/site-packages/twisted/internet/defer.py", line 1386, in _inlineCallbacks
    result = g.send(result)
  File "/Users/Bruce/git/Distributed-Multi-User-Scrapy-System-with-a-Web-UI/venv/lib/python2.7/site-packages/scrapy/crawler.py", line 95, in crawl
    six.reraise(*exc_info)
  File "/Users/Bruce/git/Distributed-Multi-User-Scrapy-System-with-a-Web-UI/venv/lib/python2.7/site-packages/scrapy/crawler.py", line 79, in crawl
    yield self.engine.open_spider(self.spider, start_requests)
KeyError: 'username'