Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/conda/18/lib/python3.7/site-packages/sphinx/cmd/build.py", line 280, in build_main
    app.build(args.force_all, filenames)
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/conda/18/lib/python3.7/site-packages/sphinx/application.py", line 348, in build
    self.builder.build_update()
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/conda/18/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 299, in build_update
    len(to_build))
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/conda/18/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 311, in build
    updated_docnames = set(self.read())
  File "/home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/conda/18/lib/python3.7/site-packages/sphinx/builders/__init__.py", line 422, in read
    self.env.doc2path(self.config.master_doc))
sphinx.errors.SphinxError: master file /home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/checkouts/18/docs/index.rst not found

Sphinx error:
master file /home/docs/checkouts/readthedocs.org/user_builds/sphinx-verilog-domain/checkouts/18/docs/index.rst not found