Clone dropdown is not showing url with https protocol


I’m using gitlab 11.11.3. When I enter to some project and I see the Clone downdown and it shows ‘Clone with HTTP’ with url I wish it shows The Home page URL (Sign-in restrictions) is So I tried to change the property external_url from to on /etc/gitlab/gitlab.rb file, but I get the following error message:

Running handlers:
There was an error running gitlab-ctl reconfigure:

letsencrypt_certificate[] (letsencrypt::http_authorization line 3) had an error: Acme::Client::Error::Unauthorized: acme_certificate[staging] (/opt/gitlab/embedded/cookbooks/cache/cookbooks/letsencrypt/resources/certificate.rb line 20) had an error: Acme::Client::Error::Unauthorized: Account creation on ACMEv1 is disabled. Please upgrade your ACME client to a version that supports ACMEv2 / RFC 8555. See for details.

Just it case, on firewall the ports 80 and 443 are enabled.

What can I do?