Nov 20 10:30:21.321 - [ERROR] Except stack:Traceback (most recent call last): 
 "C:\XX-Net-3.8.1\XX-Net-3.8.1\code\default\gae_proxy\local\google_ip.py", line 625, in scan_ip_worker ip = google_ip_range.ip_range.get_ip() 
 "C:\XX-Net-3.8.1\XX-Net-3.8.1\code\default\gae_proxy\local\google_ip_range.py", line 208, in get_ip return self.get_ipv4() 
 "C:\XX-Net-3.8.1\XX-Net-3.8.1\code\default\gae_proxy\local\google_ip_range.py", line 212, in get_ipv4 index = random.randint(0, len(self.ip_range_list) - 1) 
 "C:\XX-Net-3.8.1\XX-Net-3.8.1\code\default\python27\1.0\lib\random.py", line 242, in randint return self.randrange(a, b+1) 
 "C:\XX-Net-3.8.1\XX-Net-3.8.1\code\default\python27\1.0\lib\random.py", line 218, in randrange raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, istop, width) ValueError: empty range for randrange() (0,0, 0)
WARNING: Writing cache to u'/home/chunhao/.cache/youtube-dl/youtube-sigfuncs/js_mVwz_86.json' failed: Traceback (most recent call last):

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 369, in _extract_signature_function
cache_res = res(test_string)

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 530, in <lambda>
return lambda s: initial_function([s])

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 525, in resf
res = interpret_statement(stmt, local_vars)

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 460, in interpret_statement
v = interpret_expression(expr, local_vars, allow_recursion)

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 513, in interpret_expression
raise ExtractorError(u'Unsupported JS expression %r' % expr)ExtractorError: Unsupported JS expression u'$y(a,7)'; 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.