Internal Error

[andrescala]

Hi everyone,
I've installed in docker the NGINX and I'm trying to add the certificate but
I get everytime a internal errror!!

Error: Command failed: certbot certonly --config "/etc/letsencrypt.ini"
--cert-name "npm-2" --agree-tos --authenticator webroot --email
"xxx at gmail.com" --preferred-challenges "dns,http" --domains "xxx.xxx.xxx" 
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org.
See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with
-v for more details.

    at ChildProcess.exithandler (child_process.js:308:12)
    at ChildProcess.emit (events.js:314:20)
    at maybeClose (internal/child_process.js:1022:16)
    at Process.ChildProcess._handle.onexit
(internal/child_process.js:287:5)

What I'm doing wrong?
I have already the subdomain pointing to the ip !

Thanks

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,292939,292939#msg-292939