@comment and @online not recognized ; and error message is unhelpful

The following fails:

@online{NoteFrequencies1977,
   title={Musical Note to Frequency Conversion Chart},
   author={Backus, J},
  year={1977},
  url = {\url{http://www.audiology.org/sites/default/files/ChasinConversionChart.pdf}},
  urldate = {2016-05-06}
 }

with the unhelpful message:

parsing bibtex file /home/markgalassi/Erivate/.tmp/hackingcamp-teacher-manual/small-courses/hackingcamp.bib... parsed 6 entries

Exception occurred: File "/home/markgalassi/.local/lib/python2.7/site-packages/pybtex/style/formatting/init.py", line 60, in format_entries f = getattr(self, "format_" + entry.type) AttributeError: 'Style' object has no attribute 'format_online' The full traceback has been saved in /tmp/sphinx-err-dhWrol.log, if you want to report the issue to the developers. Please also report this if it was a user error, so that a better error message can be provided next time. A bug report can be filed in the tracker at https://github.com/sphinx-doc/sphinx/issues. Thanks!

Similar things happen with @comment when I comment a whole block. Note that @online is a biblatex introduction, not there in old bibtex. Still it should be supported, and it should give a more useful error message.

I'm attaching the stack trace from /tmp

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