in the circus, tornadio2 occur error

Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/tornado/websocket.py", line 494, in _run_callback
    result = callback(*args, **kwargs)
  File "/usr/local/lib/python3.4/dist-packages/TornadIO2-0.0.3-py3.4.egg/tornadio2/persistent.py", line 91, in open
    raise HTTPError(401, "Invalid Session")
tornado.web.HTTPError: HTTP 401: Unauthorized (Invalid Session)