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

 "youtube_dl\extractor\youtube", line 1380, in _decrypt_signature


Traceback (most recent call last):


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/exceptions.py", line 617, in conda_exception_handler

return_value = func(*args, **kwargs)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/cli/main.py", line 137, in _main

exit_code = args.func(args, p)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/cli/main_update.py", line 65, in execute

install(args, parser, 'update')


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/cli/install.py", line 210, in install

unknown=index_args['unknown'], prefix=prefix)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 120, in get_index

index = fetch_index(channel_priority_map, use_cache=use_cache)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 445, in fetch_index

repodatas = _collect_repodatas(use_cache, urls)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 433, in _collect_repodatas

repodatas = _collect_repodatas_serial(use_cache, urls)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 401, in _collect_repodatas_serial

for url in urls]


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 401, in <listcomp>

for url in urls]


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 141, in func

res = f(*args, **kwargs)


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 385, in fetch_repodata

mod_etag_headers.get('_mod'))


 "/home/little/anaconda3/lib/python3.6/site-packages/conda/core/index.py", line 212, in fetch_repodata_remote_request

raise CondaRuntimeError("Invalid index file: {0}: {1}".format(join_url(url, filename), e))

conda.exceptions.CondaRuntimeError: Runtime error: Invalid index file: https://repo.continuum.io/pkgs/free/linux-64/repodata.json.bz2: Missing dependencies for SOCKS support.
