YouTube - Could not find JS function 'Go.sH'

[ddevault]

sircmpwn@homura ~> youtube-dl "https://www.youtube.com/watch?v=4_GsN43-IX8"
[youtube] Setting language
[youtube] 4_GsN43-IX8: Downloading webpage
[youtube] 4_GsN43-IX8: Downloading video info webpage
[youtube] 4_GsN43-IX8: Extracting video information
[youtube] 4_GsN43-IX8: Encrypted signatures detected.
[youtube] 4_GsN43-IX8: Downloading js player vflCGk6yw
WARNING: Writing cache to '/home/sircmpwn/.cache/youtube-dl/youtube-sigfuncs/js_vflCGk6yw_84.json' failed: Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 392, in _extract_signature_function
    cache_res = res(test_string)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 179, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 48, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 140, in interpret_expression
    self._functions[fname] = self.extract_function(fname)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 170, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'Go.sH'; 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.

ERROR: Automatic signature extraction failed: Traceback (most recent call last):
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 477, in _decrypt_signature
    return func(s)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 450, in <lambda>
    return lambda s: initial_function([s])
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 179, in resf
    res = self.interpret_statement(stmt, local_vars)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 48, in interpret_statement
    v = self.interpret_expression(expr, local_vars, allow_recursion)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 140, in interpret_expression
    self._functions[fname] = self.extract_function(fname)
  File "/usr/lib/python3.4/site-packages/youtube_dl/jsinterp.py", line 170, in extract_function
    raise ExtractorError('Could not find JS function %r' % funcname)
youtube_dl.utils.ExtractorError: Could not find JS function 'Go.sH'; 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.
; 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.

[phihag]

Be sure to call youtube-dl with the --verbose flag and include its complete output here. Most likely, you'll see that you have an outdated version (YouTube changed their player the day before yesterday, so you'll need 2014.07.25 or newer). Make sure you are using the latest version.

It looks like you installed youtube-dl with a package manager (most likely apt-get, pip or pacman). You can use that package manager to update youtube-dl (you may need to contact the package maintainer though, and request an update).

Alternatively, uninstall the youtube package and follow our manual installation instructions. From then on, you'll be able to update with sudo youtube-dl -U