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

 "/Users/jmb/depots/p4/.virtualenv/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 872, in _decrypt_signature
video_id, player_url, len(s)

 "/Users/jmb/depots/p4/.virtualenv/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 374, in _extract_signature_function
res = self._parse_sig_js(code)

 "/Users/jmb/depots/p4/.virtualenv/lib/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 442, in _parse_sig_js
u'Initial JS player signature function name')

 "/Users/jmb/depots/p4/.virtualenv/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 377, 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.
Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 493, in extract_info
ie_result = ie.extract(url)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 158, in extract
return self._real_extract(url)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 1517, in _real_extract
r'<h1 class="pl-header-title">(.*?)</h1>', page, u'title')

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 366, in _html_search_regex
res = self._search_regex(pattern, string, name, default, fatal, flags)

 "/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 title; 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.