lxml error

[adrianhust]

No handlers could be found for logger "readability.readability"
Traceback (most recent call last):
File "readability_parse.py", line 73, in
page_content = readability_about(html_path)
File "readability_parse.py", line 26, in readability_about
page_content = Document(html_str).summary()
File "build/bdist.linux-x86_64/egg/readability/readability.py", line 195, in summary
File "build/bdist.linux-x86_64/egg/readability/readability.py", line 147, in summary
File "build/bdist.linux-x86_64/egg/readability/readability.py", line 105, in _html
File "build/bdist.linux-x86_64/egg/readability/readability.py", line 109, in _parse
File "build/bdist.linux-x86_64/egg/readability/htmls.py", line 21, in build_doc
File "/home/work/anaconda2/lib/python2.7/site-packages/lxml/html/init.py", line 614, in document_fromstring
value = etree.fromstring(html, parser, **kw)
File "lxml.etree.pyx", line 3103, in lxml.etree.fromstring (src/lxml/lxml.etree.c:70569)
File "parser.pxi", line 1828, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:106403)
File "parser.pxi", line 1716, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:105194)
File "parser.pxi", line 1086, in lxml.etree._BaseParser._parseDoc (src/lxml/lxml.etree.c:99876)
File "parser.pxi", line 580, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:94350)
File "parser.pxi", line 690, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:95786)
File "parser.pxi", line 631, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:95065)
readability.readability.Unparseable: None