Unable to download from pytube

I am a person who writes scripts using pytube and downloads video files from youtube.
I was able to download it smoothly until yesterday, but suddenly I can't.
Try running the script in Pycharm
I got an error message while downloading the video file.
In other words,

yt=YouTube('https://www.youtube.com/watch?**********')

In , create a YouTube object

print(yt.title+' downloading...\n')

displays the title successfully.However,

yt.streams.filter(progressive=True, file_extension='mp4') .order_by('resolution') .desc().first().download(
dl_path

When I got to , the process stopped

AttributeError: 'NoneType' object has no attribute 'span'

The message appears.

Yesterday, I automatically downloaded about 60 programs in a row.
I downloaded about the same number a few days ago.
There was no problem at that time, but
When I try to download it today, I get an error.
Reinstalling pytube will not work.

Actually, I downloaded it using YouTube-dl at first, but

Downloading multiple programs at the same time I switched to pytube because the download speed was extremely slow and the download was no longer meaningful.
On YouTube-dl, I thought it was bad that I tried to download too many at the same time, so I decided not to download multiple at the same time, but to download them one by one automatically.But it turned out like this.

Is there a solution?

I started the program on my own about a year ago.
So I don't know much about it.
Thank you for your guidance.