Video download error: http://www.56.com/u47/v_MTM5NjQ5ODc2.html

[video-dl]

An error occurred while downloading the following video: http://www.56.com/u47/v_MTM5NjQ5ODc2.html
This is the output of youtube-dl --verbose

[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--verbose', u'-J', u'http://www.56.com/u47/v_MTM5NjQ5ODc2.html']
[debug] Encodings: locale ANSI_X3.4-1968, fs ANSI_X3.4-1968, out None, pref ANSI_X3.4-1968
[debug] youtube-dl version 2015.12.29
[debug] Python version 2.7.6 - Linux-3.19.0-39-generic-x86_64-with-Ubuntu-14.04-trusty
[debug] exe versions: avconv 9.18-6, avprobe 9.18-6
[debug] Proxy map: {}
ERROR: An extractor error has occured. (caused by KeyError(u'info',)); 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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 291, in extract
return self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/c56.py", line 30, in _real_extract
info = page['info']
KeyError: u'info'
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 665, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 297, in extract
raise ExtractorError('An extractor error has occured.', cause=e)
ExtractorError: An extractor error has occured. (caused by KeyError(u'info',)); 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.

[dstftw]

Duplicate of #8073.