ERROR: Automatic signature extraction failed due to AttributeError: 'NoneType' object has no attribute 'group'

[dakrone]

Full output:

» youtube-dl -t https://www.youtube.com/watch\?v\=8Gv0H-vPoDc --verbose
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-t', 'https://www.youtube.com/watch?v=8Gv0H-vPoDc', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2014.07.20
[debug] Python version 2.7.8 - Darwin-13.2.0-x86_64-i386-64bit
[debug] Proxy map: {}
[youtube] Setting language
[youtube] 8Gv0H-vPoDc: Downloading webpage
[youtube] 8Gv0H-vPoDc: Downloading video info webpage
[youtube] 8Gv0H-vPoDc: Extracting video information
[youtube] 8Gv0H-vPoDc: Encrypted signatures detected.
[youtube] encrypted signature length 83 (55.27), itag 22, html5 player en_US-vflkX5nuy\/html5player
ERROR: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 472, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 354, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 472, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 354, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 516, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 168, in extract
    return self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 851, in _real_extract
    encrypted_sig, video_id, player_url, age_gate)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 482, in _decrypt_signature
    u'Automatic signature extraction failed: ' + tb, cause=e)
ExtractorError: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 472, in _decrypt_signature
    video_id, player_url, len(s)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 354, in _extract_signature_function
    player_type = id_m.group('ext')
AttributeError: 'NoneType' object has no attribute 'group'
; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type  youtube-dl -U  to update.

[jaimeMF]

Fixed in the last versions, run sudo youtube-dl -U to upgrade to 2014.07.24 or higher.