RegexNotFoundError: Unable to extract csrf token - www.safaribooksonline.com

[vigo]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.06.05. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.06.05

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

[debug] System config: []
[debug] User config: [u'-o', u'%(autonumber)03d-%(title)s.%(ext)s', u'--prefer-ffmpeg']
[debug] Custom config: []
[debug] Command-line args: [u'-u', u'PRIVATE', u'-p', u'PRIVATE', u'--verbose', u'https://www.safaribooksonline.com/library/view/go-concurrency/9781788394161/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.06.05
[debug] Git HEAD: 01d39850b564
[debug] Python version 2.7.12 - Darwin-16.6.0-x86_64-i386-64bit
[debug] exe versions: avconv 12, avprobe 12, ffmpeg 3.3.2, ffprobe 3.3.2
[debug] Proxy map: {}
[safari:course] Downloading login form
[safari:course] Logging in as -----------
[safari:course] Login successful
[safari:course] 9781788394161: Downloading course JSON
[download] Downloading playlist: Go Concurrency
[safari:course] playlist Go Concurrency: Collected 10 video ids (downloading 10 of them)
[download] Downloading video 1 of 10
[safari:api] Downloading login form
ERROR: Unable to extract csrf token; 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 "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 761, in extract_info
    ie_result = ie.extract(url)
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 432, in extract
    self.initialize()
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 390, in initialize
    self._real_initialize()
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/safari.py", line 28, in _real_initialize
    self._login()
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/safari.py", line 50, in _login
    login_page, 'csrf token')
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 791, in _html_search_regex
    res = self._search_regex(pattern, string, name, default, fatal, flags, group)
  File "/Users/----/.pyenv/versions/2.7.12/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 782, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract csrf token; 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.

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Description of your issue, suggested solution and other information

I had never issues with safaribooks till this one: https://www.safaribooksonline.com/library/view/go-concurrency/9781788394161/