KeyError: 'url_encoded_fmt_stream_map' 에러 수정 어떻게??

Traceback (most recent call last):
  File "C:\kim\workspace\test3\youtube-download0.py", line 3, in <module>

    yt=pytube.YouTube("https://www.youtube.com/watch?v=CTRO5NXmAp8")
  File "C:\Users\Duksoo\Anaconda3\lib\site-packages\pytube\__main__.py", line 88, in __init__
    self.prefetch_init()
  File "C:\Users\Duksoo\Anaconda3\lib\site-packages\pytube\__main__.py", line 97, in prefetch_init
    self.init()
  File "C:\Users\Duksoo\Anaconda3\lib\site-packages\pytube\__main__.py", line 143, in init
    mixins.apply_descrambler(self.player_config_args, fmt)
  File "C:\Users\Duksoo\Anaconda3\lib\site-packages\pytube\mixins.py", line 96, in apply_descrambler
    for i in stream_data[key].split(',')
KeyError: 'url_encoded_fmt_stream_map'

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