I have a problem with dislike error when creating an pafy.new url, perhaps it's because youtube hid numer of dislikes
Solution 1:
just comment the line 53 and 54 from backend_youtube_dl.py in your packages path
Solution 2:
There's a less heinous solution than editing package files by using an older version of youtube-dl.
Just run pip install youtube-dl==2020.12.2