Traceback (most recent call last):

 "/usr/share/w3af/w3af/core/ui/gui/main.py", line 611, in start_scan_wrap
real_scan_start()

 "/usr/share/w3af/w3af/core/ui/gui/main.py", line 602, in real_scan_start
self.w3af.start()

 "/usr/share/w3af/w3af/core/controllers/w3afCore.py", line 275, in start
self.scan_end_hook()

 "/usr/share/w3af/w3af/core/controllers/w3afCore.py", line 473, in scan_end_hook
parser_cache.dpc.clear()

 "/usr/share/w3af/w3af/core/data/parsers/parser_cache.py", line 59, in clear
mp_doc_parser.stop_workers()

 "/usr/share/w3af/w3af/core/data/parsers/mp_document_parser.py", line 99, in stop_workers
self._processes.clear()AttributeError: 'NoneType' object has no attribute 'clear'
Traceback (most recent call last):

 "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 651, in _real_extract
doc = parse_xml(webpage)

 "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 1411, in parse_xml
tree = xml.etree.ElementTree.XML(s.encode('utf-8'), **kwargs)

 "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1300, in XML
parser.feed(text)

 "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1642, in feed
self._raiseerror(v)

 "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1506, in _raiseerror
raise errParseError: undefined entity: line 23, column 0