Unable to load org.eclipse.jetty.websocket.server.WebSocketServerFactory

1. Run Karaf and install odl-netconf-topology and odl-restconf-nb features
2. Change use SSE setting to use-sse=false in restconf-nb-(5.0.2-SNAPSHOT)-config.cfg
3. Run Postman collection requests #1 and #2 to create data change event subscription.
4. In Linux command line run: wscat --header "Authorization: Basic YWRtaW46YWRtaW4=" -c ws://localhost:8181/rests/data-change-event-subscription/network-topology:network-topology/datastore=CONFIGURATION/scope=SUBTREE

You will get response 500, see attached karaf.log.