csv批量导入用户后找不到网页，麻烦哪位大佬帮忙看看如何解决。
日志如下：
2019-01-21 20:56:55,981 [ERROR] django.request:256 handle_uncaught_exception Internal Server Error: /useradmin/batchadduser/
Traceback (most recent call last):
File “/seafile/seafile-server-6.0.8/seahub/thirdpart/Django-1.8.17-py2.7.egg/django/core/handlers/base.py”, line 132, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File “/seafile/seafile-server-6.0.8/seahub/seahub/auth/decorators.py”, line 27, in _wrapped_view
return view_func(request, *args, **kwargs)
File “/seafile/seafile-server-6.0.8/seahub/seahub/base/decorators.py”, line 26, in _decorated
return func(request, *args, **kwargs)
File “/seafile/seafile-server-6.0.8/seahub/seahub/views/sysadmin.py”, line 1796, in batch_add_user
content = content.decode(encoding, ‘replace’).encode(‘utf-8’)
TypeError: decode() argument 1 must be string, not None