Essentials XMPP Nullpointer Exception

Hey guys,

I got the essentials XMPP with all the other stuff in the Essentials-pack. And honestly, I have no idea what the xmpp part does.

But well, it throws me always an exception (already at the beginning, when essentials was the only plugin)... so, what could it be?

Code:

[19:29:21] [Server thread/WARN]: [Essentials] Task #1064 for Essentials v2.13.1 generated an exception
java.lang.NullPointerException
    at com.earth2me.essentials.xmpp.XMPPManager.updatePresence(XMPPManager.java:171) ~[?:?]
    at com.earth2me.essentials.xmpp.EssentialsXMPP.updatePresence(EssentialsXMPP.java:123) ~[?:?]
    at com.earth2me.essentials.xmpp.EssentialsXMPPPlayerListener$2.run(EssentialsXMPPPlayerListener.java:59) ~[?:?]
    at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:600) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]

 

http://wiki.ess3.net/wiki/XMPP
It must be set up before it can do pretty much anything.