no soa rr's found?

[Vincent Hillier]

Hello
Yesterday I noticed my reverse zone was not loading...
said wrong serial, so after changing the serial 300 times and getting
the same answer.
I decided to come to the group =)
Anyone know why this is happening?
it was all fine yesterday and no one has changed anything.
here is the errors in syslog.

Dec  4 19:05:15 ns named[11642]: primary/204.92.67.50:3: SOA for
"in-addr.arpa" not at zone top "67.92.204.in-addr.arpa"
Dec  4 19:05:15 ns named[11642]: primary/204.92.67.50:9: data
"in-addr.arpa" outside zone "67.92.204.in-addr.arpa" (ignored)
Dec  4 19:05:15 ns named[11642]: primary/204.92.67.50:10: data
"in-addr.arpa" outside zone "67.92.204.in-addr.arpa" (ignored)
Dec  4 19:05:15 ns named[11642]: primary/204.92.67.50:11: data
"in-addr.arpa" outside zone "67.92.204.in-addr.arpa" (ignored)
Dec  4 19:05:15 ns named[11642]: Zone "67.92.204.in-addr.arpa" (file
primary/204.92.67.50): no NS RRs found at zone top
Dec  4 19:05:15 ns named[11642]: master zone "67.92.204.in-addr.arpa"
(IN) rejected due to errors (serial 1999112815)


And now here is the zone.
$TTL 43200
$ORIGIN in-addr.arpa.
@ IN SOA ns.techdreams.com. support.techdreams.com. (
   1999112815 ; serial
   3600 ; refresh
   900 ; retry
   1209600 ; expire
   43200 ; default_ttl
   )
@  IN PTR ns.techdreams.com.
@  IN NS ns.techdreams.com.
;
; techdreams Reverse mappings
;
50.67.92.204    IN      PTR     ns.techdreams.com.
50.67.92.204    IN      PTR     www.techdreams.com.
50.67.92.204    IN      PTR     ftp.techdreams.com.
50.67.92.204    IN      PTR     mail.techdreams.com.

Any help would be greatly appreciated.