Comment 2 for bug 1665116

The error seen when running this today, on d42c319eb:

writing output... [100%] specs/template

/home/eharney/src/cinder-specs/doc/source/specs/newton/discovering-system-capabilities.rst:267: WARNING: Could not lex literal_block as "json". Highlighting skipped.
generating indices...
writing additional pages... search
copying static files... done
copying extra files... done
dumping search index in English (code: en) ... done
dumping object inventory... done
build succeeded, 9 warnings.

Exception occurred:
  File "/home/eharney/src/cinder-specs/.tox/docs/lib/python3.6/site-packages/yasfb/formatter.py", line 451, in format_rss2_file
    handle.write(string.encode('utf-8'))
TypeError: write() argument must be str, not bytes
The full traceback has been saved in /tmp/sphinx-err-ovx59a4r.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!
ERROR: InvocationError: '/home/eharney/src/cinder-specs/.tox/docs/bin/python setup.py build_sphinx'
_____________________________________________ summary _____________________________________________
ERROR: docs: commands failed