All ReadTheDocs builds failing

See error below.

Running Sphinx v1.8.5
loading translations [en]... done
making output directory...
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 4 source files that are out of date
updating environment: 4 added, 0 changed, 0 removed
reading sources... [ 25%] CHANGELOG
reading sources... [ 50%] documentation
/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/recommonmark/parser.py:65: UserWarning: Container node skipped: type=document
  warn("Container node skipped: type={0}".format(mdnode.t))
/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/checkouts/574/docs/source/documentation.rst:364: WARNING: Title underline too short.

Morphometrics of a specific image from multiple folders
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/checkouts/574/docs/source/documentation.rst:364: WARNING: Title underline too short.

Morphometrics of a specific image from multiple folders
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/cmd/build.py", line 304, in build_main
    app.build(args.force_all, filenames)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/application.py", line 341, in build
    self.builder.build_update()
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 347, in build_update
    len(to_build))
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 360, in build
    updated_docnames = set(self.read())
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 468, in read
    self._read_serial(docnames)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 490, in _read_serial
    self.read_doc(docname)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/builders/__init__.py", line 534, in read_doc
    doctree = read_doc(self.app, self.env, self.env.doc2path(docname))
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/io.py", line 318, in read_doc
    pub.publish()
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/docutils/core.py", line 219, in publish
    self.apply_transforms()
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/docutils/core.py", line 200, in apply_transforms
    self.document.transformer.apply_transforms()
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/transforms/__init__.py", line 90, in apply_transforms
    Transformer.apply_transforms(self)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/docutils/transforms/__init__.py", line 171, in apply_transforms
    transform.apply(**kwargs)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/transforms/__init__.py", line 245, in apply
    apply_source_workaround(n)
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/util/nodes.py", line 94, in apply_source_workaround
    for classifier in reversed(node.parent.traverse(nodes.classifier)):
TypeError: 'generator' object is not reversible

Exception occurred:
  File "/home/docs/checkouts/readthedocs.org/user_builds/axondeepseg/envs/574/lib/python3.6/site-packages/sphinx/util/nodes.py", line 94, in apply_source_workaround
    for classifier in reversed(node.parent.traverse(nodes.classifier)):
TypeError: 'generator' object is not reversible
The full traceback has been saved in /tmp/sphinx-err-29su1y1l.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!

The last build that worked was about a week and a half ago.

I don’t see any problems reported about the ReadTheDocs servers themselves.

[mathieuboudreau]

Euhm, since we use an a conda environment file instead of requirements.txt, I think this will need a bit more back-and-forth tinkering than I have time for at the moment, as I can’t just copy your file over. I’ll let this simmer and revisit it ASAP.

[dyt811]

Yup. Looks similar to IvadoMed issue https://github.com/ivadomed/ivadomed/issues/973 https://github.com/ivadomed/ivadomed/pull/974