Cannot add Virtual Bridge Domains in DLUX

When using DLUX to add a new bridge domain, a window appears asking for a name, but then clicking on 'Add' has no effect.

By debugging the rest call in Google Chrome, it shows the following info:

angular.js:11048
PUT http://localhost:8181/restconf/config/network-topology:network-topology/topology/testBD

With the following content:

{"topology":[{"topology-id":"testBD","topology-types":{"vbridge-topology:vbridge-topology":{}},"underlay-topology":[

],"vbridge-topology:tunnel-type":"tunnel-type-vxlan","vbridge-topology:vxlan":

,"vbridge-topology:flood":"true","vbridge-topology:forward":"true","vbridge-topology:learn":"true","vbridge-topology:unknown-unicast-flood":"true","vbridge-topology:arp-termination":"false"}]}