Could somebody tell me why my master zone is rejected, please ?

[Daniel Pope]

Hello.
I'm trying to set  my domain name but I get always the following message

localhost named [ ] : master zone  "ticket2print.com" IN rejected due to errors  (serial 2000081601)

I used the below file (domain name ticket2print.com, IP= 64.232.5.110, local machine is hercules):
Thank you very much for any eventual hints !
 
I'm running RED  HAT 6.1 Linux  and the file (I pasted it ) is: 
;
; Zone file for ticket2print.com
;
; The full zone
;


ticket2print.com. IN  SOA  ns1.ticket2print.com. hostmaster.ticket2print.com. (
       2000081601    ; serial number, today  
       10800         ;Refresh after 3 hours
       3600          ;Retry after 1 hour
       604800        ;expire after a week
       86400 )       ;Minimum TTK of 1 day
;
;  Name servers
;
ns1.ticket2print.com.  IN   NS  hercules.ticket2print.com.
ns2.ticket2print.com.  IN   NS  hercules.ticket2print.com.
;
; Addresses for canonical names
;
localhost.ticket2print.com.  IN    A   127.0.0.1; 
hercules.ticket2print.com.   IN    A   64.232.5.110;
;
; Aliases
;
www.ticket2print.com. IN  CNAME hercules.ticket2print.com.
;ns1.ticket2print.com. IN  CNAME hercules.ticket2print.com.

;
;Mail routing
;
ticket2print.com.   IN   MX    10      hercules.ticket2print.com.