ERROR: This video is unavailable (youtube stream)

[fyn777]

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.youtube.com/watch?v=21X4N1ZJnFg']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2018.05.09
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.16299
[debug] exe versions: ffmpeg N-84014-g9e6b269
[debug] Proxy map: {}
[youtube] 21X4N1ZJnFg: Downloading webpage
[youtube] 21X4N1ZJnFg: Downloading video info webpage
[youtube] 21X4N1ZJnFg: Extracting video information
WARNING: unable to extract video duration; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
ERROR: This video is unavailable.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmplwokk3j3\build\youtube_dl\YoutubeDL.py", line 792, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmplwokk3j3\build\youtube_dl\extractor\common.py", line 503, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmplwokk3j3\build\youtube_dl\extractor\youtube.py", line 1974, in _real_extract
youtube_dl.utils.ExtractorError: This video is unavailable.
...
<end of log>

A week ago I used "youtube-dl.exe -f 96 -g https://www.youtube.com/watch?v=21X4N1ZJnFg" command
And its work good until today: ERROR: This video is unavailable
In browser video is available