instapaper fails

[miwie]

Has somebody already found why the builtin recipe 'instapaper' fails?

It looks like fetching the article with 'parse_index' still works but I get error messages like:

Parsing file 'feed_1/index.html' as HTML
Forcing feed_1/index.html into XHTML namespace
Parsing feed_0/index.html ...
Initial parse failed:
Traceback (most recent call last):
  File "site-packages\calibre\ebooks\oeb\base.py", line 818, in first_pass
  File "lxml.etree.pyx", line 2532, in lxml.etree.fromstring (src/lxml/lxml.etree.c:48270)
  File "parser.pxi", line 1545, in lxml.etree._parseMemoryDocument (src/lxml/lxml.etree.c:71812)
  File "parser.pxi", line 1417, in lxml.etree._parseDoc (src/lxml/lxml.etree.c:70608)
  File "parser.pxi", line 898, in lxml.etree._BaseParser._parseUnicodeDoc (src/lxml/lxml.etree.c:67148)
  File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:63824)
  File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:64745)
  File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64088)
XMLSyntaxError: Opening and ending tag mismatch: hr line 29 and div, line 30, column 7

[kovidgoyal]

those aren't critical errors, they just mean that the html could not be parsed using an XHTML parser, so calibre will fall back to using a heuristic parser.