Check nameservers Unable to resolve nameserver [ns1.yourdomain.com]

Hi all! Did anyone encounter this type of error: Check nameservers Unable to resolve nameserver [ns1.yourdomain.com]? It is within ‘WHM Settings Check’ section and only appears when running ‘Run again and display all checks’ report. It disappears completely within ‘Run again’ report. What could possibly be the cause for this?