copy(/var/aegir/config/letsencrypt.d/example.com/fullchain.pem): failed to open [warning] stream: No such file or directory FileSystem.php:19

Problem/Motivation

I have installed:
Aegir HTTPS - https://www.drupal.org/project/hosting_https
following the documentation:
https://git.drupalcode.org/project/hosting_https/blob/HEAD/README.md
ALMOST all works when I verify I have 2 warning / errors:

copy(/var/aegir/config/letsencrypt.d/example.com/fullchain.pem): failed to open stream: No such file or directory FileSystem.php:19 - warning

failed to copy HTTPS certificate in place - warning

Steps to reproduce

https://git.drupalcode.org/project/hosting_https/blob/HEAD/README.md

Is a problem that someone else has experienced already?
The HTTPS is still not working although AEGIR seems that has generated the certificate but is not able to transfer to the right place (I guess).

Any idea how to solve this?

Thank you!
Gilles