python example goes well but lua example failed

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vis = require 'visdom'()
vis.ipv6 = false
vis:text{text = 'Hello, world!'}

I also added LocalForward 127.0.0.1:8097 127.0.0.1:8097 at the start of ~/.ssh/config file. when I post the message by vis:text{text = 'Hello, world!'}, error occured like follows:

ERROR:tornado.application:Uncaught exception POST /events (127.0.0.1)
HTTPServerRequest(protocol='http', host='localhost', method='POST', uri='/events', version='HTTP/1.1', remote_ip='127.0.0.1', headers={'Content-Length': '159', 'Host': 'localhost', 'Te': 'trailers', 'Content-Type': 'application/text', 'Connection': 'close, TE', 'User-Agent': 'LuaSocket 3.0-rc1'})
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/tornado/web.py", line 1332, in _execute
    result = method(*self.path_args, **self.path_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/visdom/server.py", line 253, in post
    ptype = args['data'][0]['type']
KeyError: u'data'
ERROR:root:ERROR: 500: {'exc_info': (<type 'exceptions.KeyError'>, KeyError(u'data',), <traceback object at 0x7faa9dff2290>)}
ERROR:tornado.access:500 POST /events (127.0.0.1) 1.02ms

Can anyone tell me why and how to solve it, Thank you very much in advance!

[geekvc]

Good job, this command solved my issue. Thank you very much for your great work!

[JackUrb]

Hi @geekvc - We were just able to upload the correct version of visdom to PyPI. You should be able to use it after running pip install --upgrade visdom. Let me know if this solves the issue for you!