resultcallback issue

[ghost]

Today I found the tc420 library and wanted to try it out. I want to be able to controle my aquariumlights from my linux-laptop and was therefor hopefull.

After installing it in a venv (as instructed on running pip install tc420) I get this error:
~/.venv/bin/tc420 --help
Traceback (most recent call last):
File "/home/arnold/.venv/bin/tc420", line 5, in
from tc420.main import main
File "/home/arnold/.venv/lib/python3.12/site-packages/tc420/main.py", line 286, in
@cmd_group.resultcallback()
^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Group' object has no attribute 'resultcallback'. Did you mean: 'result_callback'?

What is causing this and how can I fix it or get round it?