Unable Download Videos from niconico.

[kairi003]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2016.12.01. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

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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:

[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--verbose', 'http://www.nicovideo.jp/watch/sm26715926']
[debug] Encodings: locale cp932, fs mbcs, out cp932, pref cp932
[debug] youtube-dl version 2016.12.01
[debug] Python version 3.4.4 - Windows-10-10.0.14393
[debug] exe versions: ffmpeg N-80801-gc0cb53c, ffprobe N-80801-gc0cb53c
[debug] Proxy map: {}
[niconico] sm26715926: Downloading webpage
[niconico] sm26715926: Downloading video info page
[niconico] sm26715926: Downloading webpage
ERROR: Unable to extract thumbPlayKey; 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.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\YoutubeDL.py", line 694, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\common.py", line 357, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\niconico.py", line 141, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp6j6yd3lp\build\youtube_dl\extractor\common.py", line 660, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract thumbPlayKey; 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.

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Description of your issue, suggested solution and other information

I can't downroad videos from niconico(http://www.nicovideo.jp/), even through I could before (the latest download is at Nov. 30, 2016).
I think that it is caused by an inability to extract thumbPlayKey because of any Changes of Site.
I'm sorry but I'm not very familiar, so I report only.
I wish it fix early, and I’m counting on you.

[dstftw]

Duplicate of #11170.