Openfire hazelcast

i config 2 pc to run openfire hazelcast。openfire’ version is 3.9.3 。hazelcast plugin i used openfire source code to build,the version is .3.1.7。why one openfire such a problem below。

and logs

com.jivesoftware.util.cache.ClusteredCacheFactory - Failed to execute cluster task within 30 seconds

java.util.concurrent.TimeoutException

at com.hazelcast.spi.impl.InvocationImpl$InvocationFuture.resolveResponse(Invocati onImpl.java:466)

at com.hazelcast.spi.impl.InvocationImpl$InvocationFuture.get(InvocationImpl.java: 314)

at com.hazelcast.util.executor.DelegatingFuture.get(DelegatingFuture.java:66)