If you are using the Travis Continuous Integration
service, your problem could be related to the CTAN
mirrors having yet to update.
The issue appears in the Travis R community forum:
might be related to the recent switch to TexLive-2019 as the LaTeX package manager seems to fail finding inconsolata in the repository.
It looks to me like the mirror chosen was has not updated to 2019, so I think this will resolve itself naturally when the mirrors catch up. If not I can look into it.
In the meantime, I solved it by forcing a previous version of TeXLive with a downgrade to OSX 10.12 in
# macOS 10.12 version
See this Travis
page for the
correspondence between XCode and OSX versions and the original thread in DevOps