metabase_api_python: authentication triggers an error simplejson.errors.JSONDecodeError

I installed the package and I tried to authenticate with both the command line and a script, yet it’s not working. When I run this code

from metabase_api import Metabase_API

Metabase_API("http://localhost:4009/","test@test.com","test123")

I’m getting the following error in the my terminal

Traceback (most recent call last):
  File "mbmap.py", line 59, in <module>
    Metabase_API("http://localhost:4009/","test@test.com","test123")
  File "/home/test/.local/lib/python3.8/site-packages/metabase_api/metabase_api.py", line 13, in __init__
    self.authenticate()
  File "/home/test/.local/lib/python3.8/site-packages/metabase_api/metabase_api.py", line 25, in authenticate
    self.session_id = res.json()['id']
  File "/usr/lib/python3/dist-packages/requests/models.py", line 897, in json
    return complexjson.loads(self.text, **kwargs)
  File "/usr/lib/python3/dist-packages/simplejson/__init__.py", line 518, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3/dist-packages/simplejson/decoder.py", line 370, in decode
    obj, end = self.raw_decode(s)
  File "/usr/lib/python3/dist-packages/simplejson/decoder.py", line 400, in raw_decode
    return self.scan_once(s, idx=_w(s, idx).end())
simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)