KeyError: 'url_encoded_fmt_stream_map' 에러가 발생합니다.

import pytube

yt = pytube.YouTube("https://www.youtube.com/watch?v=VpP3fvAmSt4")

단 두줄 작성했는데 오류가 발생하는 참사가 발생했습니다.ㅠㅠ

Traceback (most recent call last):

  File "/Users/sangsoohan/PycharmProjects/section2/youtube_downloader.py", line 3, in <module>

    yt = pytube.YouTube("https://www.youtube.com/watch?v=VpP3fvAmSt4")

  File "/Users/sangsoohan/opt/anaconda3/envs/section2/lib/python3.5/site-packages/pytube/__main__.py", line 88, in __init__

    self.prefetch_init()

  File "/Users/sangsoohan/opt/anaconda3/envs/section2/lib/python3.5/site-packages/pytube/__main__.py", line 97, in prefetch_init

    self.init()

  File "/Users/sangsoohan/opt/anaconda3/envs/section2/lib/python3.5/site-packages/pytube/__main__.py", line 143, in init

    mixins.apply_descrambler(self.player_config_args, fmt)

  File "/Users/sangsoohan/opt/anaconda3/envs/section2/lib/python3.5/site-packages/pytube/mixins.py", line 96, in apply_descrambler

    for i in stream_data[key].split(',')

KeyError: 'url_encoded_fmt_stream_map'