EOFException on hazelcast upgrade from 3.11.4 to 5.1.1

[Sanket Dhok]

Getting an error when upgrading  hazelcast upgrade from 3.11.4 to 5.1.1

com.hazelcast.nio.serialization.HazelcastSerializationException: java.io.EOFException    at com.hazelcast.internal.serialization.impl.SerializationUtil.handleException(SerializationUtil.java:63)    at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:193)    at com.hazelcast.nio.tcp.TcpIpConnectionManager.accept(TcpIpConnectionManager.java:203)    at com.hazelcast.nio.tcp.TcpIpConnectionManager.accept(TcpIpConnectionManager.java:63)    at com.hazelcast.spi.impl.NodeEngineImpl$ConnectionManagerPacketConsumer.accept(NodeEngineImpl.java:511)    at com.hazelcast.spi.impl.NodeEngineImpl$ConnectionManagerPacketConsumer.accept(NodeEngineImpl.java:505)    at com.hazelcast.spi.impl.PacketDispatcher.accept(PacketDispatcher.java:83)    at com.hazelcast.spi.impl.PacketDispatcher.accept(PacketDispatcher.java:31)    at com.hazelcast.nio.tcp.PacketDecoder.onPacketComplete(PacketDecoder.java:83)    at com.hazelcast.nio.tcp.PacketDecoder.onRead(PacketDecoder.java:65)    at com.hazelcast.internal.networking.nio.NioInboundPipeline.process(NioInboundPipeline.java:135)    at com.hazelcast.internal.networking.nio.NioThread.processSelectionKey(NioThread.java:368)    at com.hazelcast.internal.networking.nio.NioThread.processSelectionKeys(NioThread.java:353)    at com.hazelcast.internal.networking.nio.NioThread.selectLoop(NioThread.java:279)    at com.hazelcast.internal.networking.nio.NioThread.run(NioThread.java:234) Caused by: java.io.EOFException: null