Received message from unsupported version: [2.0.0] minimal compatible version is: [5.0.0] - Elasticsearch - Discuss the Elastic Stack

Received message from unsupported version: [2.0.0] minimal compatible version is: [5.0.0] - Elasticsearch - Discuss the Elastic Stack

When I am starting elastic server, I am continously getting the below exception:
java.lang.IllegalStateException: Received message from unsupported version: [2.0.0] minimal compatible version is: [5.0.0]
at org.elasticsearch.transport.TcpTransport.messageReceived(TcpTransport.java:1199) ~[elasticsearch-5.0.0.jar:5.0.0]
at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:74) ~[transport-netty4-5.0.0.jar:5.0.0]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:372) [netty-transport-4.1.5.Final.jar:4.1.5.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:358) [netty-transport-4.1.5.Final.jar:4.1.5.Final]

what could be the problem for the above error, I do not have any 2.0.0 version nodes running in the cluster

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