java.util.concurrent.ExecutionException: java.lang.NullPointerException

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java.util.concurrent.ExecutionException: java.lang.NullPointerException
at com.microsoft.Malmo.Server.ServerStateMachine$WaitingForAgentsEpisode.onCastAssembled(ServerStateMachine.java:747)
at com.microsoft.Malmo.Server.ServerStateMachine$WaitingForAgentsEpisode.onMessage(ServerStateMachine.java:626)
at com.microsoft.Malmo.MalmoMod$MalmoMessageHandler$1.run(MalmoMod.java:382)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(Unknown Source)
at net.minecraft.server.MinecraftServer.tick(Unknown Source)
at net.minecraft.server.integrated.IntegratedServer.tick(Unknown Source)
at java.lang.Thread.run(Unknown Source)

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