NameError: global name 'FileNotFoundError' is not defined

[feesx]

File "/root/wechat-admin/libs/wx.py", line 53, in get_logged_in_user
user_ = bot.self
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 347, in getattr
return getattr(self._get_current_object(), name)
File "/usr/local/lib/python2.7/dist-packages/werkzeug/local.py", line 306, in _get_current_object
return self.__local()
File "/root/wechat-admin/libs/globals.py", line 8, in _find_bot
top = get_bot()
File "/root/wechat-admin/libs/wx.py", line 35, in get_bot
here, '../static/img/qr_code.png'), console_qr=None)
File "/root/wechat-admin/src/wxpy/wxpy/api/bot.py", line 89, in init
except FileNotFoundError as e:
NameError: global name 'FileNotFoundError' is not defined