rstudio – R studio no longer allowing me to download / install packages

Cant install packages

> install.packages("tidyverse")
Warning in install.packages :
  unable to access index for repository
  cannot open URL ''

this is what i have tried so far

  1. i have tried using a CRAN repository closer to me (im in sydney australia) – this didnt help

  2. i have tried downloading rtools42 – didnt help

  3. i have unchecked the box in packages “use secure download method for http”

  4. i have even tried using an external repository

    and then tried to install.packages
    but that still didnt help

I really am not sure what to do

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