Certificate fails, can't create it

[BianPuelo]

Hi, I've been having the following problem after trying to use certbot and i don't know what should i do.

My domain is: draco.puelo.com.ar

I ran this command: sudo certbot certonly --webroot --preferred-challenges http --agree-tos -m bianca@puelotech.com -d draco.puelo.com.ar

It produced this output: `Waiting for verification...
Challenge failed for domain draco.puelo.com.ar
http-01 challenge for draco.puelo.com.ar
Cleaning up challenges
Some challenges have failed.

IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: draco.puelo.com.ar
  Type: unauthorized
  Detail: Invalid response from
  http://draco.puelo.com.ar/.well-known/acme-challenge/RmtMhPlHjY8iwN5JVtJgmdzB6CyKzEDhroFFuRbcu2o
  [54.86.132.71]: "\n\n404 Not
  Found\n\n

  Not Found

  \n<p"

  To fix these errors, please make sure that your domain name was
  entered correctly and the DNS A/AAAA record(s) for that domain
  contain(s) the right IP address.`

My hosting provider, if applicable, is: nic.ar

I can login to a root shell on my machine (yes or no, or I don't know): yes

The version of my client is: certbot 0.40.0

[Osiris]

Hi there Bianca and welcome to the Community

Just wondering, did you read the command you've used in some kind of guide perhaps? Because it seems there's an element missing from the command, but I think it will help if we can see where you got the command from, before I give away the missing element