Unable to extract html5 player

[ghost]

youtube-dl -f best -ciw -o "%(title)s.%(ext)s" -v http://www.youtube.com/channel/UCw7e6lal7RW8XuR2jewIAww
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-f', u'best', u'-ciw', u'-o', u'%(title)s.%(ext)s', u'-v', u'http://www.youtube.com/channel/UCw7e6lal7RW8XuR2jewIAww']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.12.09
[debug] Python version 2.7.13 (CPython) - Linux-4.9.0-8-amd64-x86_64-with-debian-9.6
[debug] exe versions: avconv 3.2.12-1, avprobe 3.2.12-1, ffmpeg 3.2.12-1, ffprobe 3.2.12-1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube:channel] UCw7e6lal7RW8XuR2jewIAww: Downloading channel page
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading webpage
[download] Downloading playlist: Uploads from Juzni Vetar 2 StudioMMI
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #1
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #2
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #3
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #4
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #5
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #6
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #7
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #8
[youtube:playlist] UUw7e6lal7RW8XuR2jewIAww: Downloading page #9
[youtube:playlist] playlist Uploads from Juzni Vetar 2 StudioMMI: Downloading 940 videos
[download] Downloading video 1 of 940
[youtube] Jl3U0wANNX0: Downloading webpage
[youtube] Jl3U0wANNX0: Downloading video info webpage
WARNING: unable to extract html5 player; 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.