Letsencrypt error: cannot change profile for the next exec call: No such file or directory

Am I used Certbot? I have lost track of whether Virtualmin uses it or has it’s own methods.

The question arises because the LetsEncrypt forum/help system asks this question and asks for the output of certbot --version, which yields:
cannot change profile for the next exec call: No such file or directory

So maybe the certbot profile is missing?