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

 "youtube_dl\extractor\youtube.pyo", line 962, in _decrypt_signature

 "youtube_dl\extractor\youtube.pyo", line 530, in <lambda>

 "youtube_dl\extractor\youtube.pyo", line 525, in resf

 "youtube_dl\extractor\youtube.pyo", line 460, in interpret_statement

 "youtube_dl\extractor\youtube.pyo", line 513, in interpret_expressionExtractorError: 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
Traceback (most recent call last):

 "sqlmap.py", line 179, in main
start()

 "lib/core/decorators.py", line 71, in _
result = f(*args, **kwargs)

 "lib/controller/controller.py", line 675, in start
action()

 "lib/controller/action.py", line 165, in action
conf.dbmsHandler.dumpAll()

 "plugins/generic/entries.py", line 500, in dumpAll
self.dumpTable()

 "plugins/generic/entries.py", line 417, in dumpTable
value = NULL if column in emptyColumns else inject.getValue(query, union=False, error=False, dump=True)

 "lib/core/decorators.py", line 71, in _
result = f(*args, **kwargs)

 "lib/request/inject.py", line 447, in getValue
value = _goInferenceProxy(query, fromUser, batch, unpack, charsetType, firstChar, lastChar, dump)

 "lib/request/inject.py", line 294, in _goInferenceProxy
outputs = _goInferenceFields(expression, expressionFields, expressionFieldsList, payload, charsetType=charsetType, firstChar=firstChar, lastChar=lastChar, dump=dump)

 "lib/request/inject.py", line 140, in _goInferenceFields
output = _goInference(payload, expressionReplaced, charsetType, firstChar, lastChar, dump, field)

 "lib/request/inject.py", line 112, in _goInference
count, value = bisection(payload, expression, length, charsetType, firstChar, lastChar, dump)

 "lib/techniques/blind/inference.py", line 622, in bisection
val = getChar(index, asciiTbl, not(charsetType is None and conf.charset))

 "lib/techniques/blind/inference.py", line 394, in getChar
if retried < MAX_REVALIDATION_STEPS:TypeError: '<' not supported between instances of 'NoneType' and 'int'