it's 2 node openstack newton setup with linuxbridge

This "could not load interface.agent.linux.BridgeInterfaceDriver" warning is there in my l3-agent conf file and dhcp-agent file . don't know how to resolve and found no solution on internet.

there is one more error showing in l3-agent

qg and qr device already present and in dashboard floating ip status is showing N/A beacuse it is taking /32 i.e 192.168.100.8/32 on associating with Vm. beacuse of this my instance is not accesible from outside.