[Youtube] Unable to extract Initial JS player signature function name

[ParzivalWolfram]

Initial Command> youtube-dl https://youtu.be/6vQ71voOb-Q --verbose

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://youtu.be/6vQ71voOb-Q', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.01.17
[debug] Python version 3.6.8 (CPython) - Linux-4.15.0-58-generic-x86_64-with-LinuxMint-19.1-tessa
[debug] exe versions: ffmpeg 4.1.4-1, ffprobe 4.1.4-1
[debug] Proxy map: {}
[youtube] 6vQ71voOb-Q: Downloading webpage
[youtube] 6vQ71voOb-Q: Downloading video info webpage
WARNING: Unable to extract video title
[youtube] {22} signature length 111, html5 player vflB-cY7Z
[youtube] 6vQ71voOb-Q: Downloading player https://www.youtube.com/yts/jsbin/player_ias-vflB-cY7Z/en_US/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1232, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1140, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1204, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract \x1b[0;34mInitial JS player signature function name\x1b[0m; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1232, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1140, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1204, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1232, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1140, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1204, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/YoutubeDL.py", line 793, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 508, in extract
    ie_result = self._real_extract(url)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1891, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1242, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
youtube_dl.utils.ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1232, in _decrypt_signature
    video_id, player_url, s
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1140, in _extract_signature_function
    res = self._parse_sig_js(code)
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/youtube.py", line 1204, in _parse_sig_js
    jscode, 'Initial JS player signature function name', group='sig')
  File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 983, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
 (caused by RegexNotFoundError('Unable to extract \x1b[0;34mInitial JS player signature function name\x1b[0m; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

uname -a output:
Linux euclidean-spice 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019 x86_64 GNU/Linux