Without thinking about it very much, my first guess would be that
this is a transient problem on win-builder, i.e. the caret package is
temporarily unavailable for some reason (e.g. because some update step
hung); a new version of the package was published *fairly* recently
(2021-05-15), alt
I have a puzzling error from win-builder for a package.
My package is https://github.com/jonathan-g/datafsm, also
https://cran.r-project.org/web/packages/datafsm. I am preparing a
bug-fix release to CRAN to fix an error that CRAN recently identified in
the previous release of this package (see
