Can't install 'usethis' package

Question

I'm using R-4.1.1 and the last version of Rstudio.

My goal is to use the ggradar package but I cannot install it with install.packages because:

le package ‘ggradar’ is not available for this version of R

So I would like to install the application like this:

devtools::install_github("ricardo-bion/ggradar", dependencies=TRUE)

I managed to install devtools but when I try to:

library(devtools)

there is this error:

Error: le package ‘usethis’ nécessaire pour ‘devtools’, mais est introuvable

When I trying to install devtools with

install.packages("devtools",dependencies =TRUE)

it doesn't work. So finally, I try to install the package usethis

install.packages("usethis")

but I can't do it: I have a big error which ends with:

Warning in install.packages : installation of package ‘usethis’ had non-zero exit status

Can you help me please?

Answer 1

I don't know the exact reason for your case, but things like this can happen as a result of an inconsistent package set. It is in general a good idea to update installed packages before installing new ones.

As you have seen, package usethis depends on devtools, see: https://CRAN.R-project.org/package=usethis that also shows that usethis is availabe for R 4.1.1.

In inconsistency already happened, i.a. due to an upgrade from R 4.1.0 or other installations, de-installation of the suspect packages, or just deletion of the user library can help in most cases.

How to do this depends on the operating system.