errors about json.load(r.content) code

the pycharm show the error :
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
I try many methods but can't solve it

Me too. Is this the wrong page? The sensro/aggregated path has no content.
r = requests.get(SENSOR_AGGREGATED, auth=HTTPBasicAuth(username, password), params=urlencode(params))
print r.content