I'm setting up a private DNS server using bind9 on raspian.  I'm receiving this error on my reverse zone file:named-checkzone dthacker.org db.dthacker.org.invroot@dns:/etc/bind# named-checkzone dthacker.org db.dthacker.org.inv    zone dthacker.org/IN: NS 'dns.dthacker.org' has no address records (A or          AAAA)This is my reverse zone file:$TTL    604800@       IN      SOA        dns.dthacker.org. root.dthacker.org. (                   2015052003           ; Serial (NOTE: Needs to increment every time you restart BIND)                    3600           ; Refresh [1h]                     600           ; Retry   [10m]                    86400           ; Expire  [1d]                     600 )         ; Negative Cache TTL [1h]    IN       NS      dns.dthacker.org.30.1    IN      PTR      dns.dthacker.org.61.1    IN      PTR      vhost.dthacker.org.The forward file is passing without errors.  I can't see the error in this one. 
named-checkzone fails reverse zone file with NS has no address records (A or AAAA)
dns;bind9