ERROR: Signature extraction failed: Traceback (most recent call last):

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 877, in _decrypt_signature
video_id, player_url, s

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 792, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 855, in _parse_sig_js
initial_function = jsi.extract_function(funcname)

 "/usr/lib64/python2.7/site-packages/youtube_dl/jsinterp.py", line 241, in extract_function
raise ExtractorError('Could not find JS function %r' % funcname)ExtractorError: Could not find JS function u'gr'; 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.
Traceback (most recent call last):


 "C:\Users\dellpc\Anaconda3\lib\site-packages\qtconsole\manager.py", line 27, in poll

super(QtKernelRestarter, self).poll()


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\restarter.py", line 113, in poll

self.kernel_manager.restart_kernel(now=True, newports=newports)


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 368, in restart_kernel

self.start_kernel(**self._launch_args)


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 261, in start_kernel

self._connect_control_socket()


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\manager.py", line 210, in _connect_control_socket

self._control_socket = self.connect_control()


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\connect.py", line 571, in connect_control

return self._create_connected_socket('control', identity=identity)


 "C:\Users\dellpc\Anaconda3\lib\site-packages\jupyter_client\connect.py", line 543, in _create_connected_socket

sock = self.context.socket(socket_type)


 "C:\Users\dellpc\Anaconda3\lib\site-packages\zmq\sugar\context.py", line 146, in socket

s = self._socket_class(self, socket_type, **kwargs)


 "C:\Users\dellpc\Anaconda3\lib\site-packages\zmq\sugar\socket.py", line 59, in __init__

super(Socket, self).__init__(*a, **kw)


 "zmq/backend/cython/socket.pyx", line 328, in zmq.backend.cython.socket.Socket.__init__
zmq.error.ZMQError: Unknown error
