Cron <root at horae> /usr/local/bin/certbot renew

[Cron Daemon]

Saving debug log to /var/log/letsencrypt/letsencrypt.log

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Processing /etc/letsencrypt/renewal/tcube.autonlab.org.conf
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Cert is due for renewal, auto-renewing...
Non-interactive renewal: random delay of 431.75982359294227 seconds
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for tcube.autonlab.org
Waiting for verification...
Challenge failed for domain tcube.autonlab.org
http-01 challenge for tcube.autonlab.org
Cleaning up challenges
Attempting to renew cert (tcube.autonlab.org) from /etc/letsencrypt/renewal/tcube.autonlab.org.conf produced an unexpected error: Some challenges have failed.. Skipping.
All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/tcube.autonlab.org/fullchain.pem (failure)

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All renewal attempts failed. The following certs could not be renewed:
  /etc/letsencrypt/live/tcube.autonlab.org/fullchain.pem (failure)
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1 renew failure(s), 0 parse failure(s)
IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: tcube.autonlab.org
   Type:   dns
   Detail: No valid IP addresses found for tcube.autonlab.org