error when run this demo

[linboqiao]

I try to run this demo, but a error occured, the detail is followed:

Traceback (most recent call last):
File "test.py", line 30, in
itcount()
File "test.py", line 24, in itcount
counter = json.loads(a)
File "C:\Users\dsigma\Anaconda2\lib\json_init_.py", line 339, in loads
return _default_decoder.decode(s)
File "C:\Users\dsigma\Anaconda2\lib\json\decoder.py", line 364, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "C:\Users\dsigma\Anaconda2\lib\json\decoder.py", line 382, in raw_decode
raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded