java.lang.NullPointerException: data cannot be null

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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.

java.lang.NullPointerException: data cannot be null
at net.citizensnpcs.api.npc.SimpleMetadataStore.checkPrimitive(
at net.citizensnpcs.api.npc.SimpleMetadataStore.setPersistent(
at net.citizensnpcs.api.npc.AbstractNPC$1.setPersistent(
at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(
at net.minecraft.server.v1_10_R1.MinecraftServer.D(
at net.minecraft.server.v1_10_R1.DedicatedServer.D(
at net.minecraft.server.v1_10_R1.MinecraftServer.C(
at Source)

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