Error with namserver

All fresh install;
Ubuntu: 22.4
Virtualmin: 7.1-1
Webmin: 1.999

Error on after I tried to change System hostname:
“Failed to save DNS configuration : ‘’’ is not a valid domain name”

Please make sure that entered hostname doesn’t contain spaces and/or any characters other than alphanumeric (latin letters and arabic digits) ; dashes also allowed.

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