Well this time the message was different:, here it is:
Warning in install.packages :
unable to access index for repository https://cloud.r-project.org/src/contrib:
'wget' call had nonzero exit status
Installing package into ‘C:/Users/Manar/Documents/R/win-library/3.5’
(as ‘lib’ is unspecified)
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/src/contrib:
'wget' call had nonzero exit status
Warning in install.packages :
package ‘extraTrees’ is not available (for R version 3.5.3)
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.5:
'wget' call had nonzero exit status
> library(extraTrees)
Error in library(extraTrees) : there is no package called ‘extraTrees’