Installation failed: error in running command

[julozi]

Hi,

I have tried to install ggbiplot using :

> library(devtools)
> install_github("vqv/ggbiplot", ref = "experimental")

And I get the following output :

Downloading GitHub repo vqv/ggbiplot@experimental
from URL https://api.github.com/repos/vqv/ggbiplot/zipball/experimental
Installation failed: error in running command

I'm using R version 3.4.1 (2017-06-30) -- "Single Candle"

Any hint ?