Unable to download JSON metadata: HTTP Error 404: NOT FOUND

[pushpikaa]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.12.02. 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 Issues with outdated version will be rejected.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 2017.12.02

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

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• 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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youtube-dl --verbose -u <username> -p <password>  -f best  -o './videos/%(playlist)s/%(chapter_number)s - %(chapter)s/%(playlist_index)s-%(title)s.%(ext)s'  https://www.udemy.com/<removed>
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'-u', u'PRIVATE', u'-p', u'PRIVATE', u'-f', u'best', u'-o', u'./videos/%(playlist)s/%(chapter_number)s - %(chapter)s/%(playlist_index)s-%(title)s.%(ext)s', u'<removed>']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.02
[debug] Python version 2.7.12+ - Linux-4.8.0-41-generic-x86_64-with-Ubuntu-16.10-yakkety
[debug] exe versions: ffmpeg 3.0.7-0ubuntu0.16.10.1, ffprobe 3.0.7-0ubuntu0.16.10.1, rtmpdump 2.4
[debug] Proxy map: {}
[udemy:course] Downloading login popup
[udemy:course] Logging in
[udemy:course] <removed>: Downloading webpage
[udemy:course] <removed>: Downloading course curriculum
[download] Downloading playlist: <removed>
[udemy:course] playlist <removed>
[download] Downloading video <removed>
[udemy] Downloading login popup
[udemy] <removed>: Downloading webpage
[udemy] <removed>: Downloading lecture JSON
ERROR: Unable to download JSON metadata: HTTP Error 404: NOT FOUND (caused by HTTPError()); 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.
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 506, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2196, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python2.7/urllib2.py", line 435, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 548, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 473, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 556, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

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Description of your issue, suggested solution and other information

I tried to download a udemy course. however for some videos, I get above error. The same issue was reported earlier by other users, but those issues were closed indicating that the issue is resolved in the latest release.
However I'm using the latest version and I'm still getting this error.

[KngZhi]

same here.

[dstftw]

You must provide concrete URL.