Raspberry error certificado

Hola
Estoy haciendo pruebas de montar un certicado en la raspberry pi, la privmera vez no tube problemas por crearlas, pero luego me dió errores, volví a instalar el sistema varias veces,, y ahora creo otro dominio totalmente difernete. y me dá este error
Error: Command failed: /usr/bin/certbot certonly --non-interactive --config "/etc/letsencrypt.ini" --cert-name "npm-1" --agree-tos --email "o???@gmail.com" --preferred-challenges "dns,http" --domains "o???.duckdns.org"
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for o??.duckdns.org
Using the webroot path /data/letsencrypt-acme-challenge for all unmatched domains.
Waiting for verification...
Challenge failed for domain o???.duckdns.org
http-01 challenge for o???.duckdns.org
Cleaning up challenges
Some challenges have failed.

at ChildProcess.exithandler (child_process.js:308:12)
at ChildProcess.emit (events.js:314:20)
at maybeClose (internal/child_process.js:1051:16)
at Process.ChildProcess._handle.onexit (internal/child_process.js:287:5)

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