我是win8的环境,64位,运行scrapy的时候报这个错了,但是没搜索到原因,求救

C:\Python27\Scripts>scrapy.exe
Traceback (most recent call last):
  File "C:\Python27\Scripts\scrapy-script.py", line 5, in <module>
    from pkg_resources import load_entry_point
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 3070, in <mod
ule>
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 3056, in _cal
l_aside
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 3083, in _ini
tialize_master_working_set
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 645, in _buil
d_master
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 946, in requi
re
  File "build\bdist.win-amd64\egg\pkg_resources\__init__.py", line 833, in resol
ve
pkg_resources.DistributionNotFound: The 'six>=1.5.2' distribution was not found
and is required by Scrapy