Error: "Signature extraction failed" started occurring today

[wanshou]

Just started receiving this error today while using my script that has been working for a while. Any ideas/suggestions?

ERROR: Signature extraction failed: Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 828, in _decrypt_signature
video_id, player_url, s
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 755, in _extract_signature_function
cache_res = res(test_string)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 807, in
return lambda s: initial_function([s])
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 254, in resf
res, abort = self.interpret_statement(stmt, local_vars)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 55, in interpret_statement
v = self.interpret_expression(expr, local_vars, allow_recursion)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/jsinterp.py", line 135, in interpret_expression
self._objects[variable] = self.extract_object(variable)
File "/usr/local/lib/python2.7/dist-packages/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; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

[dstftw]

You are using an outdated version of youtube-dl. Read our FAQ if you have troubles updating.

[wanshou]

I was just coming back to say that upgrading to the latest version fixed my issue.

Thanks for the prompt response.