devicehive-backend run-tim error( WebSocketKafkaProxyClient)

[kaushal1214]

These are the logs
2019-06-07 14:07:02.001 [main] INFO com.hazelcast.core.LifecycleService - hz.client_0 [dev] [3.8.1] HazelcastClient 3.8.1 (20170411 - f1e9264) is CLIENT_CONNECTED 2019-06-07 14:07:02.484 [main] INFO o.h.h.i.QueryTranslatorFactoryInitiator - HHH000397: Using ASTQueryTranslatorFactory 2019-06-07 14:07:02.684 [main] INFO o.s.o.j.LocalContainerEntityManagerFactoryBean - Initialized JPA EntityManagerFactory for persistence unit 'default' 2019-06-07 14:07:02.901 [main] INFO org.xnio - XNIO version 3.3.8.Final 2019-06-07 14:07:02.926 [main] INFO org.xnio.nio - XNIO NIO Implementation Version 3.3.8.Final 2019-06-07 14:07:03.017 [main] INFO io.undertow.websockets.jsr - UT026004: Adding annotated client endpoint class com.devicehive.proxy.client.WebSocketKafkaProxyClient 2019-06-07 14:07:03.084 [main] ERROR c.d.p.c.WebSocketKafkaProxyClient - Error during establishing connection: java.net.ConnectException: Connection refused
What is the problem here? Please help