ValueError when trying to install a stylesheet

[64-Tesseract]

I'm on Windows 10, with Python 3.9 and psutil installed. After downloading the script and running python -m beautifuldiscord --css discord_theme.css, I got:

Found Discord.exe under C:\Users\User\AppData\Local\Discord\app-0.0.309
Traceback (most recent call last):
File "E:\Python\3.9.2\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "E:\Python\3.9.2\lib\runpy.py", line 87, in run_code
exec(code, run_globals)
File "E:\Python\3.9.2\lib\site-packages\beautifuldiscord_main.py", line 3, in
main()
File "E:\Python\3.9.2\lib\site-packages\beautifuldiscord\app.py", line 249, in main
os.chdir(discord.script_path)
File "E:\Python\3.9.2\lib\site-packages\beautifuldiscord\app.py", line 62, in script_path
version = max(versions)
ValueError: max() arg is an empty sequence

Seems to not be detecting the installed versions or something...