JSONDecodeError when trying to logging with username and password

Hi there!
I'm currently trying to use Matrix to log in a server webpage with username and password. I'm using Python 3 and the appropriate SDK, but I'm facing an issue: Since it looks that I succeed in reaching the server page address, an error occurs when it comes to logging in:

Traceback (most recent call last):
  File "test.py", line 12, in <module>
    token = client.login(username="***", password="***", limit=10, sync=True, device_id=None)
  File "/usr/local/lib/python3.6/dist-packages/matrix_client-0.4.0.dev0-py3.6.egg/matrix_client/client.py", line 278, in login
  File "/usr/local/lib/python3.6/dist-packages/matrix_client-0.4.0.dev0-py3.6.egg/matrix_client/api.py", line 181, in login
  File "/usr/local/lib/python3.6/dist-packages/matrix_client-0.4.0.dev0-py3.6.egg/matrix_client/api.py", line 761, in _send
  File "/home/user/.local/lib/python3.6/site-packages/requests/models.py", line 897, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

My code is really basic:

#!/usr/bin/env python3
from matrix_client.client import MatrixClient
client = MatrixClient("webpage_logging_address")
token = client.login(username="***", password="***", limit=10, sync=True, device_id=None)

I've been searching for a solution for hours, without success. Any idea of why this happens and how to solve the problem?

Thanks a lot,

MyDev

Comienza reproduciendo la llamada a login desde matrix_client/client.py y sigue el procesamiento de la solicitud en matrix_client/api.py, especialmente _send y login. Inspecciona la respuesta del servidor antes del análisis de JSON y compárala con la respuesta de login esperada; se considera terminado cuando se haya identificado la causa de la respuesta vacía o que no es JSON y se haya documentado una corrección confirmada.