нет ошибки имени текущего владельца при запуске named-checkzone как в прямом, так и в обратном направлении

Я пытаюсь изучить dns и привязать на centos 7 в цифровом океане. Когда я бегу named-checkzone У меня такие же ошибки. Когда я меняю пустое пространство, я останавливаю эту ошибку только для того, чтобы заменить ее на 0 SOA и no NS error.

sudo named-checkzone example.com /etc/named/zones/example.com.zone
/etc/named/zones/example.com.zone:1: no current owner name
/etc/named/zones/example.com.zone:2: no current owner name
/etc/named/zones/example.com.zone:3: no current owner name
/etc/named/zones/example.com.zone:16: no current owner name
/etc/named/zones/example.com.zone:17: no current owner name
/etc/named/zones/example.com.zone:18: no current owner name
/etc/named/zones/example.com.zone:19: no current owner name
/etc/named/zones/example.com.zone:24: no current owner name
/etc/named/zones/example.com.zone:25: no current owner name
/etc/named/zones/example.com.zone:26: no current owner name
/etc/named/zones/example.com.zone:27: no current owner name
/etc/named/zones/example.com.zone:28: no current owner name
/etc/named/zones/example.com.zone:29: no current owner name  

$ORIGIN example.com.
$TTL 14400
@    IN    SOA    ns1.example.com.    hostmaster.example.com. (
2014071301 ; serial.  date.    today + increment
3600       ; refresh. seconds. frequency slave refreshes from master.
600        ; retry.   seconds. frequency slave retries master after failure.
604800     ; expire.  seconds. slave stops responding as authoritative.
86400      ; ttl.     seconds. Maximum caching time by resolver.
)

;------------------------------------------------------------------------------
; Special Records
;
; Note: SPF Records are limited to 10 DNS lookups recursively.
;
IN NS    ns1.example.com.
IN NS    ns2.example.com.
IN MX    10   mail.example.com.
IN TXT  "v=spf1 -ALL"

;------------------------------------------------------------------------------
; Main Records
;
@           IN A    192.0.2.1
*           IN A    192.0.2.1
ns1         IN A    192.0.2.2
ns2         IN A    192.0.2.3
mail        IN A    192.0.2.1
www         IN A   192.0.2.1

То же самое с обратным именем db.192.0

$ORIGIN  2.0.192.in-addr.arpa.
$TTL 86400

@      IN      SOA     ns1.example.com.        hostmaster.example.com. (
3 ; serial
21600      ; refresh after 6 hours
3600       ; retry after 1 hour
604800     ; expire after 1 week
86400 )    ; minimum TTL of 1 day

@  IN  NS     ns1.example.com.
2             IN      PTR     ns1.example.com.
3             IN      PTR     ns2.example.com.