Failed authorization procedure

Server
1

dear all
i have rocket chat srv i install nginx to apply https
and certbot too
when i run
sudo certbot --nginx -d chat.algorithmz.net -d www.chat.algorithmz.net
i got this

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for chat.algorithmz.net
http-01 challenge for www.chat.algorithmz.net
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. chat.algorithmz.net (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://chat.algorithmz.net/.well-known/acme-challenge/oYbxdVFGT5jWV9wW97q8AZMdFvhr0JQl__RG7E5M3B4: "<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1" 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. ....................
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