Problem installing any package in RStudio

Hi everyone. I've been trying to install some packages, but I keep getting this error message:

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 ‘scatterplot3d’ is not available (for R version 3.6.0)
Warning in install.packages :
  unable to access index for repository https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.6:
  cannot open URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.6/PACKAGES' 

I'm looking for some guidance as to what could be going wrong. The message is the same, regardless of the package. Many thanks in advance.

Usually, it indicates that you have troubles connecting to internet. Do you use proxy?

No. I was using my regular WiFi at home.

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