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

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    via GitHub by exZerry
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    via GitHub by SantaGitHub
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  • GitHub comment 42#54705045
    via GitHub by anhdenday
    • java.lang.NullPointerException: data cannot be null at[craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at net.citizensnpcs.api.npc.SimpleMetadataStore.checkPrimitive([?:?] at net.citizensnpcs.api.npc.SimpleMetadataStore.setPersistent([?:?] at net.citizensnpcs.api.npc.AbstractNPC$1.setPersistent([?:?] at[?:?] at[?:?] at[?:?] at$[?:?] at[craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat([craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at net.minecraft.server.v1_10_R1.MinecraftServer.D([craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at net.minecraft.server.v1_10_R1.DedicatedServer.D([craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at net.minecraft.server.v1_10_R1.MinecraftServer.C([craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at[craftbukkit-1.10-R0.1-SNAPSHOT-latest.jar:git-Bukkit-9af379f] at Source)[?:1.8.0_91]

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