I have MacOS Big Sur.
I installed R and then RStudio (I tried older versions too).
Installation was successful and I am able to open Rstudio.
However, I can NOT create a new Notebook. I keep getting the message "Notebook Creation Failed".
I tried to reinstall R and Rstudio but had no success.
before opening the new Notebook, I uploaded additional packages as RStudio requested.
There was a message during the "markdown" installation
please, see attached screenshot
"Lazy loading failed for package rmarkdown
Package rmarkdown was successfully installed
Installation of package rmarkdown had non-zero exit status."