VideoUnavailable

[yairrim]

I've tried using pytube3 but I keep getting this error

pytube.exceptions.VideoUnavailable: A2o3jAa-kSo is unavailable

I couldn't find any solution for this problem dose anyone knows what to do?
this is the code I'm using:
from pytube import YouTube
yt = YouTube('https://www.youtube.com/watch?v=A2o3jAa-kSo');
yt.streams.filter(only_audio=True);
ys = yt.streams.get_highest_resolution();
ys.download('C:\spotigyDL\downloaded');