The service “nameserver” appears to be down

Hi there, Received the following monitoring email - any information or process to resolve? Service Name nameserver Service Status failed ? Notification The service "nameserver" appears to be down. Service Check Method The system"s command to check or to restart this service failed. Number of Restart Attempts 1 Service Check Raw Output (XID ve8kvh) The "pdns" service is down. The subprocess "/usr/local/cpanel/scripts/restartsrv_named" reported error number 255 when it ended. Startup Log Jun 16 16:11:17 sample.com named[3029]: none:104: 'max-cache-size 90%' - setting to 57756MB (out of 64173MB) Jun 16 16:11:17 sample.com named[3029]: set up managed keys zone for view external, file 'external.mkeys' Jun 16 16:11:17 sample.com named[3029]: none:104: 'max-cache-size 90%' - setting to 57756MB (out of 64173MB) Jun 16 16:11:17 sample.com named[3029]: configuring command channel from '/etc/rndc.key' Jun 16 16:11:17 sample.com named[3029]: command channel listening on 127.0.0.1#953 Jun 16 16:11:17 sample.com named[3029]: configuring command channel from '/etc/rndc.key' Jun 16 16:11:17 sample.com named[3029]: command channel listening on ::1#953 Jun 16 16:11:17 sample.com systemd[1]: Started Berkeley Internet Name Domain (DNS). Jun 16 16:11:59 sample.com systemd[1]: Reloading Berkeley Internet Name Domain (DNS). Jun 16 16:11:59 sample.com systemd[1]: Reloaded Berkeley Internet Name Domain (DNS). Based on this