Looks like there was a warning in the readthedocs stuff, which should probably be fixed:

/home/docs/checkouts/readthedocs.org/user_builds/buildtest/checkouts/1604/docs/api/buildtest/defaults/index.rst:56: WARNING: duplicate object description of buildtest.defaults.VAR_DIR, other instance in api/buildtest/defaults/index, use :noindex: for one of them

Originally posted by @jscook2345 in #1604 (comment)