[Motherless] Unable to extract keywords

[vxbinaca]

youtube-dl -v --ignore-config --retries 100 --no-overwrites --call-home --continue --write-info-json --write-description --write-thumbnail --write-annotations --all-subs --sub-format srt --convert-subs srt --write-sub --add-metadata -f bestvideo+bestaudio/best --merge-output-format 'mkv' --embed-subs --prefer-ffmpeg --embed-thumbnail http://motherless.com/8B4BBC1

[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'--ignore-config', u'--retries', u'100', u'--no-overwrites', u'--call-home', u'--continue', u'--write-info-json', u'--write-description', u'--write-thumbnail', u'--write-annotations', u'--all-subs', u'--sub-format', u'srt', u'--convert-subs', u'srt', u'--write-sub', u'--add-metadata', u'-f', u'bestvideo+bestaudio/best', u'--merge-output-format', u'mkv', u'--embed-subs', u'--prefer-ffmpeg', u'--embed-thumbnail', u'http://motherless.com/8B4BBC1']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.02.22
[debug] Python version 2.7.10 - Linux-4.2.0-30-generic-x86_64-with-Ubuntu-15.10-wily
[debug] exe versions: ffmpeg 2.7.6-0ubuntu0.15.10.1, ffprobe 2.7.6-0ubuntu0.15.10.1, rtmpdump 2.4
[debug] Proxy map: {}
[debug] Public IP address: 76.101.221.232
[Motherless] 8B4BBC1: Downloading webpage
WARNING: unable to extract keywords; 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.
WARNING: There's no description to write.
[info] Writing video annotations to: VIDEO00441.mp4-8B4BBC1.annotations.xml
WARNING: There are no annotations to write.
[info] Writing video description metadata as JSON to: VIDEO00441.mp4-8B4BBC1.info.json
[Motherless] 8B4BBC1: Downloading thumbnail ...
[Motherless] 8B4BBC1: Writing thumbnail to: VIDEO00441.mp4-8B4BBC1.jpg
[debug] Invoking downloader on u'http://cdn.videos.motherlessmedia.com/videos/8B4BBC1.mp4?fs=opencloud'
[download] Destination: VIDEO00441.mp4-8B4BBC1.mp4
[download] 100% of 21.35MiB in 00:09
[ffmpeg] Adding metadata to 'VIDEO00441.mp4-8B4BBC1.mp4'
[debug] ffmpeg command line: ffmpeg -y -i file:VIDEO00441.mp4-8B4BBC1.mp4 -c copy -metadata artist=NMWildGirl -metadata purl=http://motherless.com/8B4BBC1 -metadata title=VIDEO00441.mp4 file:VIDEO00441.mp4-8B4BBC1.temp.mp4
[ffmpeg] There aren't any subtitles to convert
[ffmpeg] There aren't any subtitles to embed
[atomicparsley] Adding thumbnail to "VIDEO00441.mp4-8B4BBC1.mp4"
[debug] AtomicParsley command line: AtomicParsley VIDEO00441.mp4-8B4BBC1.mp4 --artwork VIDEO00441.mp4-8B4BBC1.jpg -o VIDEO00441.mp4-8B4BBC1.temp.mp4

Tried to pick a safe for work video (there is such a thing there).