Bukkit

What steps will reproduce the problem?
1. Start server with plugin active

What is the expected output? What do you see instead?

What version of the product are you using?

Do you have an error log of what happened?
2012-12-30 17:16:42 [SEVERE] Error occurred while enabling TribesNextDoor v1.3.3 (Is it up to date?)
java.lang.NullPointerException
    at org.bukkit.Location.getChunk(Location.java:73)
    at com.tribescommunity.tribesnextdoor.tribe.TribeSpawn.<init>(TribeSpawn.java:54)
    at com.tribescommunity.tribesnextdoor.data.YMLBackend.tribeInit(YMLBackend.java:427)
    at com.tribescommunity.tribesnextdoor.tribe.Tribe.<init>(Tribe.java:62)
    at com.tribescommunity.tribesnextdoor.data.YMLBackend.loadTribes(YMLBackend.java:304)
    at com.tribescommunity.tribesnextdoor.TribesNextDoor.loadData(TribesNextDoor.java:150)
    at com.tribescommunity.tribesnextdoor.TribesNextDoor.onEnable(TribesNextDoor.java:75)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugin(CraftServer.java:282)
    at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.java:264)
    at net.minecraft.server.v1_4_6.MinecraftServer.j(MinecraftServer.java:321)
    at net.minecraft.server.v1_4_6.MinecraftServer.e(MinecraftServer.java:300)
    at net.minecraft.server.v1_4_6.MinecraftServer.a(MinecraftServer.java:259)
    at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:149)
    at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
    at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)

Please provide any additional information below.

Running CraftBukkit version git-Bukkit-1.4.6-R0.2-1-g0927c11-b2584jnks (MC: 1.4.6) (Implementing API version 1.4.6-R0.3-SNAPSHOT)

Other active plugins:
2012-12-30 17:16:17 [INFO] [Vault] Enabling Vault v1.2.22-b277
2012-12-30 17:16:33 [INFO] [WorldBorder] Enabling WorldBorder v1.6.1
2012-12-30 17:16:33 [INFO] [MinecraftBot] Enabling MinecraftBot v2.2.6
2012-12-30 17:16:34 [INFO] [BadWords] Enabling BadWords v1.25
2012-12-30 17:16:35 [INFO] [GroupManager] Enabling GroupManager v2.0 (2.9.6) (Phoenix)
2012-12-30 17:16:36 [INFO] [Minequery] Enabling Minequery v1.5
2012-12-30 17:16:36 [INFO] [WorldEdit] Enabling WorldEdit v5.4.5
2012-12-30 17:16:38 [INFO] [Buycraft] Enabling Buycraft v4.7
2012-12-30 17:16:39 [INFO] [Votifier] Enabling Votifier v1.9
2012-12-30 17:16:39 [INFO] [PvPLog] Enabling PvPLog v1.0
2012-12-30 17:16:39 [INFO] [WorldGuard] Enabling WorldGuard v749-85b2cbc
2012-12-30 17:16:41 [INFO] [LogOres] Enabling LogOres v1.0.2
2012-12-30 17:16:41 [INFO] [TribesNextDoor] Enabling TribesNextDoor v1.3.3
2012-12-30 17:16:42 [INFO] [Essentials] Enabling Essentials v2.9.6
2012-12-30 17:16:44 [INFO] [EssentialsProtect] Enabling EssentialsProtect v2.9.6
2012-12-30 17:16:46 [INFO] [EssentialsSpawn] Enabling EssentialsSpawn v2.9.6
2012-12-30 17:16:46 [INFO] [EssentialsGeoIP] Enabling EssentialsGeoIP v2.9.6
2012-12-30 17:16:46 [INFO] [EssentialsChat] Enabling EssentialsChat v2.9.6

In the TribeData file where all tribe data is saved. A tribe is saved where it has the world name of a world that does not exist. This is creating the error. This can be fixed by either editing it with an existing world name. Or by deleting that tribe's data from the file