The documentation here may just be outdated, but here's the error below.
Traceback (most recent call last):
File "d:\Documents\Python\aternos.py", line 5, in <module>
from python_aternos import ServerStartError
ImportError: cannot import name 'ServerStartError' from 'python_aternos' (C:\Users\___\AppData\Local\Programs\Python\Python311\Lib\site-packages\python_aternos\__init__.py)
The documentation here may just be outdated, but here's the error below.