I am new in letsencrypt kindly guide me

Failed authorization procedure. RIz.zrg.com (tls-sni-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Correct zName not found for TLS SNI challenge. Found ‘www.zrg.com, zrg.com

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: Riz.zrg.com
    Type: unauthorized
    Detail: Correct zName not found for TLS SNI challenge. Found
    www.zrg.com, zrg.com

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

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