Build Fail Sphinx Error contents.rst not found

I've needed to have my conf.py because of the extensions I'm using so simply add

master_doc = 'contents'

to your conf.py and than

rename your index.rst to contents.rst.

Than after build passes OK you still won't see anything on ReadTheDocs, except "This page still doesn't exists" just go to:

https://your-project.readthedocs.io/en/latest/contents.html

And you'll see your docs there.

If you have your own conf.py file, it overrides Read the Doc's default conf.py. By default, Sphinx expects the master doc to be contents. Read the Docs will set master doc to index instead (or whatever it is you have specified in your settings). Try adding this to your conf.py:

master_doc = 'index'

For more information, check out this issue: https://github.com/rtfd/readthedocs.org/issues/2569