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    Take a look at this blog post on how to set up Grid2 https://goo.gl/rxzbE6. A user related (in the email group on the source) that using older selenium libs solves this exception.

java.lang.NullPointerException: channel	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:228)	at io.grpc.netty.WriteQueue.(WriteQueue.java:76)	at io.grpc.netty.NettyClientHandler.startWriteQueue(NettyClientHandler.java:223)	at io.grpc.netty.NettyClientTransport.start(NettyClientTransport.java:172)	at io.grpc.internal.ForwardingConnectionClientTransport.start(ForwardingConnectionClientTransport.java:45)	at io.grpc.internal.TransportSet.startNewTransport(TransportSet.java:215)	at io.grpc.internal.TransportSet.obtainActiveTransport(TransportSet.java:188)	at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:637)	at io.grpc.internal.ManagedChannelImpl$3.getTransport(ManagedChannelImpl.java:579)