install package problem

[Naoufal]

Hello,
Please how can i solve this problem ?
I got this message :

install.packages("vars")
Warning in install.packages :
impossible d'accéder à l'index de l'entrepôt https://cran.rstudio.com/src/contrib:
cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES'
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

[M_AcostaCH]

You need install Rtools, said the error.

You could make this in Rstudio, because the video work in R.

Downloading and Installing RTools 4.0 for Windows R 4.0.0 to R 4.1.3 (Out of Date!)

[andresrcs]

@Naoufal

impossible d'accéder à l'index de l'entrepôt https://cran.rstudio.com/src/contrib:
cannot open URL

This seems like a connectivity issue, R is not being able to connect to the CRAN repository you have selected, these are some things to try.

• Choose a different CRAN repository, RStudios repository is a good choice (http://cran.rstudio.com/) or you could choose one that is geographically closer to you.
  
  
• Disable secure download setting.
  
  
• Check if your internet connection has traffic restrictions of some kind, like a firewall, proxy server, etc. This is usually the case when you are at work or school.