misused attribute on io

[jeyraof]

$ geofront-cli start
Geofront server URL: http://ec2-54-199-24-79.ap-northeast-1.compute.amazonaws.com/
It is not a secure URL. https:// is preferred over http://. Continue (y/N)? y
Continue to authenticate in your web browser...
Press return to continue
Traceback (most recent call last):
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/bin/geofront-cli", line 9, in <module>
    load_entry_point('geofront-cli==0.2.1', 'console_scripts', 'geofront-cli')()
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/cli.py", line 413, in main
    args.function(args)
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/cli.py", line 101, in start
    authenticate.call(args)
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/cli.py", line 139, in authenticate
    if public_key and public_key.fingerprint not in client.public_keys:
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/_abcoll.py", line 369, in __contains__
    self[key]
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/client.py", line 236, in __getitem__
    code, body, error = self._request((fprint,))
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/client.py", line 214, in _request
    with self.client.request(method, path, data, headers) as resp:
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()
  File "/Users/leejaeyoung/Work/.py_envs/tmp-8a240c25debc26fe/lib/python2.7/site-packages/geofrontcli/client.py", line 113, in request
    buffered = io.ByteIO(read)
AttributeError: 'module' object has no attribute 'ByteIO'