signature error on download

[mirkobrankovic]

[youtube] Setting language
[youtube] QK8mJJJvaes: Downloading webpage
[youtube] QK8mJJJvaes: Downloading video info webpage
[youtube] QK8mJJJvaes: Extracting video information
[youtube] QK8mJJJvaes: Encrypted signatures detected.
[youtube] QK8mJJJvaes: Downloading js player vflM7pYrM
ERROR: Signature extraction failed: Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 479, in _decrypt_signature
video_id, player_url, s
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 383, in _extract_signature_function
res = self._parse_sig_js(code)
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 454, in _parse_sig_js
u'Initial JS player signature function name')
File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 391, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)

[phihag]

Most likely, you are running an outdated version of youtube-dl. The YouTube player changed on November 13th, 2014, so you'll need youtube-dl 2014.11.13 or newer to download all YouTube videos. See our FAQ on how to update.

Now, if you are using 2014.11.13 or newer (add the -v option to your command line to find out), please post the output you get with -v and we will reopen this issue. Thanks!

[mirkobrankovic]

Hi,
yes indeed, was older version.
updated now and works fine.
Thanks,
Mirko