Problem installing caret

General
1

install.packages("latitude")
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
package ‘latitude’ is not available (for R version 3.5.2)
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.5:
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'

2

Is your internet connection behind a proxy server or firewall?, this is usually the case when you are at work or school.

3

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