Exception in FRM with no flows installed on nodes

When starting the groupbasedpolicy POC, we get the exception seen in this pastebin:

http://pastebin.com/TAikKr9U

We don't get any flows installed in the vSwitches. The configuration data store shows the flows, but they don't show up in the operational data store. I don't see any errors in the ovs-vswitchd logs.