hi dear all
i'm trying to install packages in R
it connects and downloads the packeges but it does not install
here what i write to install package:
and this is the error i recieve :
trying URL 'https://cran.rstudio.com/src/contrib/devtools_2.2.1.tar.gz'
Content type 'application/x-gzip' length 372273 bytes (363 KB)
downloaded 363 KB
Warning: invalid package ‘/users/root/tmp/RtmpC4INwd/downloaded_packages/devtools_2.2.1.tar.gz’
Error: ERROR: no packages specified
The downloaded source packages are in
Updating HTML index of packages in '.Library'
Making 'packages.html' ... done
There were 50 or more warnings (use warnings() to see the first 50)
can anyone help me please