DHCPv6 Server is configured but is not running.

What am I missing?  Here is my dhcpv6 config...

g@router01# show service dhcpv6-server
 shared-network-name dhcp_ipv6 {
     subnet 1111:2222:3333:4444:5555:6666::/112 {
         address-range {
             start 1111:2222:3333:4444:5555:6666:0 {
                 stop 1111:2222:3333:4444:5555:6666:ffff
             }
         }
         name-server 2001:4860:4860::8888
         name-server 1111:2222:3333:4444:5555:aaaa:bbbb:1d3d
     }
 }

g@router01:~$ show dhcpv6 server status
DHCPv6 Server is configured but is not running.