How to fix the error Correct zName not found for TLS SNI challenge

[duchoanMU]

Hi everybody! When I run this:
./letsencrypt-auto --apache -d example.com
then

`Checking for new version…
Requesting root privileges to run letsencrypt…
sudo /home/duchoan/.local/share/letsencrypt/bin/letsencrypt --apache -d example.com
Failed authorization procedure. example.com (tls-sni-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Correct zName not found for TLS SNI challenge. Found …

IMPORTANT NOTES:

• The following errors were reported by the server:

  Domain: example.com
  Type: unauthorized
  Detail: Correct zName not found for TLS SNI challenge. Found
  ww.example.org, example.com, example.edu, example.net,
  example.org, ww.example.com, ww.example.edu, ww.example.net

  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.`

Can anybody help me fix this error? Thank you!