installing issue -- stuck on "Then start: ./venv/bin/python3 main.py"

[druptown]

I've got a problem with getting it to work.

when I get to the step

"Then start:

./venv/bin/python3 main.py"

I get the error below. The options.json is in the batmon-ha folder and has all necessary rights and the correct user.

pi@batteryshack:~/batmon-ha $ ./venv/bin/python3 main.py
error reading /data/options.json, trying options.json [Errno 2] No such file or directory: '/data/options.json'
Traceback (most recent call last):
File "/home/pi/batmon-ha/main.py", line 26, in
user_config: Dict[str, any] = load_user_config()
^^^^^^^^^^^^^^^^^^
File "/home/pi/batmon-ha/bmslib/store.py", line 70, in load_user_config
conf = dotdict(json.load(f))
^^^^^^^^^^^^
File "/usr/lib/python3.11/json/init.py", line 293, in load
return loads(fp.read(),
^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/json/init.py", line 346, in loads
return _default_decoder.decode(s)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.11/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 19 column 3 (char 320)