AttributeError: 'ThreadedDict' object has no attribute 'userrole'

[ningli16]

Reproduce steps:

1. Install CeTune master
2. Install CeTune webui
3. Add user:
   python user_Management.py -o add --user_name admin --passwd 123456 --role admin
4. Run benchmark.

There's error in "python webui.py" runtime log:

10.239.44.90:63246 - - [30/Jun/2017 10:05:00] "HTTP/1.1 GET /configuration/user_role" - 500 Internal Server Error
<Storage {'timestamp': u'2017-06-30T10:04:04.898784'}>
10.239.44.90:63246 - - [30/Jun/2017 10:05:01] "HTTP/1.1 POST /monitor/tail_console" - 200 OK
get_param:<Storage {}>
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/web.py-0.40.dev0-py2.7.egg/web/application.py", line 257, in process
return self.handle()
File "/usr/local/lib/python2.7/dist-packages/web.py-0.40.dev0-py2.7.egg/web/application.py", line 248, in handle
return self._delegate(fn, self.fvars, args)
File "/usr/local/lib/python2.7/dist-packages/web.py-0.40.dev0-py2.7.egg/web/application.py", line 488, in _delegate
return handle_class(cls)
File "/usr/local/lib/python2.7/dist-packages/web.py-0.40.dev0-py2.7.egg/web/application.py", line 466, in handle_class
return tocall(*args)
File "webui.py", line 75, in GET
return common.eval_args( self, function_name, web.input() )
File "/home/ning/upload/docker/CeTune/conf/common.py", line 605, in eval_args
if function_name != "":
File "webui.py", line 82, in user_role
output = session.userrole
File "/usr/local/lib/python2.7/dist-packages/web.py-0.40.dev0-py2.7.egg/web/session.py", line 68, in getattr
return getattr(self._data, name)
AttributeError: 'ThreadedDict' object has no attribute 'userrole'

Actually, when running python user_Management.py -o list
there is admin user listed.