Error in install.packages : unable to install packages

Help please, I have been trying to download the package dplyr into my r studio but is unable to do so - maybe due to proxy, please help

Warning in install.packages :
unable to access index for repository
cannot open URL ''

If your connection is behind a proxy server you need to set your credentials on startup. Take a look at this support article

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I wrote this:
Sys.setenv(http_proxy= "")
but still cannot work

The environment variable has to be set on startup so I think you need to use a .Renviron file as explained in the support article I linked for you.

Also, it seems you are not setting your actual credentials and proxy address.

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