保存设置的时候提示这个

Traceback (most recent call last):
File "/usr/lib/python2.6/site-packages/tornado/web.py", line 988, in _execute
getattr(self, self.request.method.lower())(*args, **kwargs)
File "/usr/lib/python2.6/site-packages/tornado/web.py", line 1739, in wrapper
return method(self, *args, **kwargs)
File "/www/v2ex/galaxy/handlers/web/settings.py", line 259, in post
self.values['member_home_top'] = member_home_top
NameError: global name 'member_home_top' is not defined