WARNING: Automatic signature extraction failed: Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 874, in _decrypt_signature
video_id, player_url, len(s)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 376, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 444, in _parse_sig_js
u'Initial JS player signature function name')

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 383, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)RegexNotFoundError: Unable to extract Initial JS player signature function name; 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):


 "/home/llu/.local/lib/python3.6/site-packages/ray/rllib/utils/tf_run_builder.py", line 47, in get

self.feed_dict, os.environ.get("TF_TIMELINE_DIR"))


 "/home/llu/.local/lib/python3.6/site-packages/ray/rllib/utils/tf_run_builder.py", line 85, in run_timeline

fetches = sess.run(ops, feed_dict=feed_dict)


 "/home/llu/.local/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 929, in run

run_metadata_ptr)


 "/home/llu/.local/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1152, in _run

feed_dict_tensor, options, run_metadata)


 "/home/llu/.local/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1328, in _do_run

run_metadata)


 "/home/llu/.local/lib/python3.6/site-packages/tensorflow/python/client/session.py", line 1348, in _do_call

raise type(e)(node_def, op, message)
tensorflow.python.framework.errors_impl.InvalidArgumentError: You must feed a value for placeholder tensor 'default/prev_reward' with dtype float and shape [?]
