I have some mistake below. How can I fix it?
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Which names would you like to activate HTTPS for?
Select the appropriate numbers separated by commas and/or spaces, or leave input
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Requesting a certificate for mysite22.ru and www.mysite22.ru
Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Detail: DNS problem: NXDOMAIN looking up A for mysite22.ru - check that a DNS record exists for this domain
Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.
Some challenges have failed.