eroor in nicovideo.jp

[hotate29]

Nice to meet you
I'm not good at English so I use Google Translate

I tried to download a video from Nico Nico Douga (nicovideo.jp) today, but such an error occurred.
Put what was output below
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.nicovideo.jp/watch/so34988745', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2010.04.24
[debug] Git HEAD: d1054a0
[debug] Python version 3.6.6 (CPython)-Darwin-15.6.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.1.2, ffprobe 4.1.2, rtmpdump 2.4
[debug] Proxy map: {}
[niconico] so34988745: Downloading webpage
[niconico] so34988745: Downloading JSON metadata for h264_720p-aac_192kbps
ERROR: Unable to download JSON metadata: HTTP Error 403: Forbidden (caused by <HTTPError 403: 'Forbidden'>); 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.
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/site-packages/youtube_dl/extractor/common.py", line 626, in _request_webpage
    return self._downloader.urlopen (url_or_request)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 2227, in urlopen
    return self._opener.open (req, timeout = self._socket_timeout)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/urllib/request.py", line 532, in open
    response = meth (req, response)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain (* args)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func (* args)
  File "/Users/hotaka.m/.pyenv/versions/3.6.6/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError (req.full_url, code, msg, hdrs, fp)