R Jupyter Notebook + RStan on Google Colab

Hello Ari, I was unable to run the script on my Drive (sorry, newcomer on Colab).
The error:

–2019-03-03 19:31:33-- https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh
Resolving repo.continuum.io (repo.continuum.io)… 104.18.200.79, 104.18.201.79, 2606:4700::6812:c84f, …
Connecting to repo.continuum.io (repo.continuum.io)|104.18.200.79|:443… connected.
HTTP request sent, awaiting response… 200 OK
Length: 69826864 (67M) [application/x-sh]
Saving to: ‘Miniconda3-latest-Linux-x86_64.sh.4’
Miniconda3-latest-L 100%[===================>] 66.59M 130MB/s in 0.5s
2019-03-03 19:31:33 (130 MB/s) - ‘Miniconda3-latest-Linux-x86_64.sh.4’ saved [69826864/69826864]
mkdir: cannot create directory ‘/root/.R/’: File exists

Have any ideias on how to surpass it?
Thanks for all the work done here!