I am running beta 3 update 2 on FC4 and am getting the following error in the log file and am not sure what to do I have restarted zimbra and rebooted to no avail any ideas on what could be occurring? We have been running fine for about 3 months and this just started occurring.

I did a zmcontrol status and it is showing that the mailbox has stopped:
root@mail ~]# su zimbra
[zimbra@mail root]$ zmcontrol status
Host mail.myagilon.com
ldap Running
logger Running
mailbox Stopped
mta Running
snmp Running
spell Running

I attached the zimbra log file to hopefully help.