Traceback (most recent call last):

  File "C:\Users\Administrator\eclipse-workspace\Final\baike_spider\spider_main.py", line 42, in <module>

    obj_spider.craw(root_url)

  File "C:\Users\Administrator\eclipse-workspace\Final\baike_spider\spider_main.py", line 19, in craw

    self.urls.add_new_url(root_url)

AttributeError: 'SpiderMain' object has no attribute 'urls'