Signature extraction failed

[adib]

athena:Downloads adib$ youtube-dl --verbose -F https://www.youtube.com/watch?v=F7CbZoyzOm0
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'--verbose', u'-F', u'https://www.youtube.com/watch?v=F7CbZoyzOm0']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.11.19
[debug] Python version 2.7.10 - Darwin-15.0.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 2.6.3, ffprobe 2.6.3
[debug] Proxy map: {}
[youtube] F7CbZoyzOm0: Downloading webpage
[youtube] F7CbZoyzOm0: Downloading video info webpage
[youtube] F7CbZoyzOm0: Extracting video information
[youtube] {22} signature length 45.42, html5 player en_US-vfln_PDe6
[youtube] F7CbZoyzOm0: Downloading player https://s.ytimg.com/yts/jsbin/player-en_US-vfln_PDe6/base.js
ERROR: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 817, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 744, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 796, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 254, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 55, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 135, in interpret_expression
    self._objects[variable] = self.extract_object(variable)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 220, in extract_object
    fields = obj_m.group('fields')
AttributeError: 'NoneType' object has no attribute 'group'
 (caused by AttributeError("'NoneType' object has no attribute 'group'",)); 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/youtube.py", line 817, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 744, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 796, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 254, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 55, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 135, in interpret_expression
    self._objects[variable] = self.extract_object(variable)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 220, in extract_object
    fields = obj_m.group('fields')
AttributeError: 'NoneType' object has no attribute 'group'
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 661, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 290, in extract
    return self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1356, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 827, in _decrypt_signature
    'Signature extraction failed: ' + tb, cause=e)
ExtractorError: Signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 817, in _decrypt_signature
    video_id, player_url, s
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 744, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 796, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 254, in resf
    res, abort = self.interpret_statement(stmt, local_vars)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 55, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 135, in interpret_expression
    self._objects[variable] = self.extract_object(variable)
  File "/usr/local/bin/youtube-dl/youtube_dl/jsinterp.py", line 220, in extract_object
    fields = obj_m.group('fields')
AttributeError: 'NoneType' object has no attribute 'group'
 (caused by AttributeError("'NoneType' object has no attribute 'group'",)); 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.

[adib]

Duplicate of #7726