vrouter cannot start after upgraded from 4.2.1 to 4.3

[stevenliang]

Hi,

I used kvm hypervisor, after upgraded, vrouter stopped and was not able 
to start.
I removed the "stopped" vrouter and created a new instance tried to 
trigger to create a new vrouter, but failed. This link is management 
server's log http://pastebin.com/Pm9J1ECk
Please help.
Thank you.
Steven