WARNING: Automatic signature extraction failed: Traceback (most recent call last):

 "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 871, in _decrypt_signature
video_id, player_url, len(s)

 "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 373, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 441, in _parse_sig_js
u'Initial JS player signature function name')

 "/usr/bin/youtube-dl/youtube_dl/extractor/common.py", line 370, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type
youtube-dl -U
to update.
WARNING: Automatic signature extraction failed: Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 957, in _decrypt_signature
video_id, player_url, len(s)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 356, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 424, in _parse_sig_js
u'Initial JS player signature function name')

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 356, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)RegexNotFoundError: Unable to extract Initial JS player signature function name; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type
youtube-dl -U
to update.