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

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 539, in _decrypt_signature
video_id, player_url, s

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 453, in _extract_signature_function
res = self._parse_sig_js(code)

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/youtube.py", line 514, in _parse_sig_js
'Initial JS player signature function name')

 "/usr/lib64/python2.7/site-packages/youtube_dl/extractor/common.py", line 432, in _search_regex
raise RegexNotFoundError('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/travis/miniconda3/envs/env_name/lib/python3.5/site-packages/skbio/io/format/tests/test_blast6.py", line 57, in test_custom_valid_multi_line
'sallacc', 'qaccver'])

 "/home/travis/miniconda3/envs/env_name/lib/python3.5/site-packages/skbio/io/registry.py", line 998, in wrapped_reader
return reader_function(fhs[-1], **kwargs)

 "/home/travis/miniconda3/envs/env_name/lib/python3.5/site-packages/skbio/io/format/blast6.py", line 272, in _blast6_to_data_frame
"Specified number of columns (%r) does not equal"

 "/home/travis/miniconda3/envs/env_name/lib/python3.5/site-packages/skbio/io/format/_blast.py", line 40, in _parse_blast_data
fh.seek(0)ValueError: I/O operation on closed file.