I used CRONR addins to schedule weekly run for R script, the R script is housed on one of VM in my company server and I'm positive that I have read and write permission for that environment but I get "Operation not permitted" error with not much information to go on with.
What is the OS/distribution of the VM? Did you check that the cron daemon is running? Can you run a cron job with crontab -e? Can you try a cronR script that does only message("Hello") (i.e. a script that doesn't try manipulating files)? If it works without manipulating files, you could try system("whoami") to check for permission problems.
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