BGP: can't connect to fd 10 : Can't assign requested address

Hi all,

I got four FreeBSD router and two of them using FreeBSD 6.1 Prerelease and
quagga 0.99.3 and the other two is using FreeBSD 5.4 with quagga 0.98.5. I
try to implement IBGP session in this 4 router and I encounter this problem
(in all router) when activate the IBGP;

2 router is distribution and 2 router is core. I think to implement IBGP I
need to run bgp daemon in distribution router (please advise).

2006/04/10 11:08:32 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:10:29 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:10:31 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:10:32 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:12:29 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:12:31 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address
2006/04/10 11:12:32 BGP: can't connect to xx.xx.xx fd 10 : Can't assign
requested address

FYI, I try to run IBGP with loopback (lo0), here is my config's file in one
of my router;

 redistribute connected
 no synchronization
 bgp log-neighbor-changes
 bgp dampening
!
 neighbor OCE-IBGP peer-group
 neighbor OCE-IBGP remote-as 65478
 neighbor OCE-IBGP update-source lo0
 neighbor OCE-IBGP next-hop-self
 neighbor OCE-IBGP soft-reconfiguration inbound
 neighbor xx.xx.xx.xx peer-group OCE-IBGP
 neighbor xx.xx.xx.xx peer-group OCE-IBGP
 neighbor xx.xx.xx.xx peer-group OCE-IBGP
!
line vty
!