"failed to find package directory" error on Travis-CI while computing code coverage

I am no longer getting code coverage for R package using covr on Travis (e.g., this build) and it gives the following error:

Travis never encountered any issues before, as can be seen from the following commits log and suddenly it stopped working-

Here is a link to the GitHub repo for this package that contains all necessary details (like yaml files for travis-ci and codecov):
https://github.com/IndrajeetPatil/ggstatsplot

Any ideas on how to get rid of this error and get travis to provide code coverage percentages for PRs and master branch again?