The zone {0} is configured to accept updates but the A record for the primary server in the zone's SOA record is not available ...

The zone {0} is configured to accept updates but the A record for the primary server in the zone's SOA record is not available on this DNS server. This may indicate a configuration problem. If the address of the primary server for the zone cannot  be resolved DNS clients will be unable to locate a server to accept updates for this zone. This will cause DNS clients to be unable to perform DNS updates.