I am trying to develope a simple karaf feature using the information given in this page (https://wiki.opendaylight.org/view/OpenDaylightController:MD-SAL:StartupProject_Archetype).

Everything is okay with BUILD SUCCESS. But when I run the controller and try to invoke the HELLO WORLD RPC from the POSTMAN Client. I get the error in json format as:

{ "error": "Authentication service unavailable" }

Can anybody tell me what can I do to resolve this problem?