If the cache folder does not exist, and createPermanent = FALSE, a temporary location is used. To make the cache permanent, call
cache(..., delete = FALSE, createPermanent = FALSE)fully qualified path to the cache folder
sub caches
if TRUE, the cache directory will be deleted.
if TRUE, the folder will be created. This is done, when
delete = TRUE after deleting the directory.
cache(createPermanent = TRUE)
and restart your R session.