kaa demo code is under study and this error has occurred. Please tell me how to fix it
[main] INFO FirstKaaDemo - FirstKaaDemo app starting!
Exception in thread "main" java.lang.RuntimeException: Unable to obtain list of bootstrap services.
at org.kaaproject.kaa.client.AbstractKaaClient.<init>(AbstractKaaClient.java:169)
at org.kaaproject.kaa.client.BaseKaaClient.<init>(BaseKaaClient.java)
at org.kaaproject.kaa.client.Kaa.newClient(Kaa.java:56)
at FirstKaaDemo.main(FirstKaaDemo.java:52)