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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.

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This exception has no message.
java.lang.NullPointerException at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:210) at com.google.common.collect.ImmutableCollection$ArrayBasedBuilder.add(ImmutableCollection.java:339) at com.google.common.collect.ImmutableList$Builder.add(ImmutableList.java:652) at com.facebook.presto.raptor.storage.organization.ShardOrganizerUtil.getShardRange(ShardOrganizerUtil.java:231) at com.facebook.presto.raptor.storage.organization.ShardOrganizerUtil.toShardIndexInfo(ShardOrganizerUtil.java:118) at com.facebook.presto.raptor.storage.organization.ShardCompactionManager.filterAndCreateCompactionSets(ShardCompactionManager.java:199) at com.facebook.presto.raptor.storage.organization.ShardCompactionManager.discoverShards(ShardCompactionManager.java:174) at com.facebook.presto.raptor.storage.organization.ShardCompactionManager.lambda$startDiscovery$0(ShardCompactionManager.java:151) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)