Error while running challenge-cli

[asutosh-vassar]

I just installed challenge-cli using pip install challenge-cli.
Then I tried to run this command challenges --platforms CC
But I get the following error:

Traceback (most recent call last):
  File "/home/asutosh/.local/bin/challenges", line 11, in <module>
    sys.exit(main())
  File "/home/asutosh/.local/lib/python2.7/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/home/asutosh/.local/lib/python2.7/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/home/asutosh/.local/lib/python2.7/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/asutosh/.local/lib/python2.7/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/home/asutosh/.local/lib/python2.7/site-packages/challenges/cli.py", line 168, in main
    all_contests = get_all_contests(platforms, time)
  File "/home/asutosh/.local/lib/python2.7/site-packages/challenges/cli.py", line 98, in get_all_contests
    contests_data = get_contests_data()
  File "/home/asutosh/.local/lib/python2.7/site-packages/challenges/cli.py", line 31, in get_contests_data
    return req.json()
  File "/home/asutosh/.local/lib/python2.7/site-packages/requests/models.py", line 819, in json
    return json.loads(self.text, **kwargs)
  File "/usr/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.7/json/decoder.py", line 382, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded