导入错误：没有名为greenlet的模块

Question

我安装了gevent，但是当我尝试使用gevent启动服务器时，它会显示导入错误，如下所示：

C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\openerp-server --gevent
Traceback (most recent call last):
  File "openerp-server", line 5, in <module>
  File "C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\.\openerp\cli
\__init__.py", line 60, in main
    o.run(args)
  File "C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\.\openerp\cli
\server.py", line 281, in run
    main(args)
  File "C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\.\openerp\cli
\server.py", line 226, in main
    import gevent
  File "C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\.\gevent\__in
it__.py", line 35, in <module>
    from gevent.hub import get_hub, iwait, wait
  File "C:\Program Files\OpenERP 7.0-20140118-002423\Server\server\.\gevent\hub.
py", line 8, in <module>
    import greenlet  # http://pypi.python.org/pypi/greenlet/
ImportError: No module named greenlet