Bukkit

What steps will reproduce the problem?
1. Start 1.4.7 server
2. Receive error
3. Mobs dont spawn

What is the expected output? What do you see instead?
Mobs should spawn.... mobs dont spawn....
Same config file that was working on 1.4.6

What version of the product are you using?
6.4

Do you have an error log of what happened?

01:01:15 [INFO] Starting minecraft server version 1.4.7
01:01:15 [INFO] Default game type: SURVIVAL
01:01:16 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.7-R0.1
-b2602jnks (MC: 1.4.7) (Implementing API version 1.4.7-R0.1)
01:01:17 [INFO] [MobSpawn] Loading MobSpawn v0.6.4
01:01:17 [INFO] [Vault] Enabling Vault v1.2.23-b301
01:01:17 [INFO] [Vault][Permission] SuperPermissions loaded as backup permission
system.
01:01:17 [INFO] [Vault] Enabled Version 1.2.23-b301
01:01:30 [INFO] [MobSpawn] Enabling MobSpawn v0.6.4
01:01:30 [SEVERE] Error occurred while enabling MobSpawn v0.6.4 (Is it up to dat
e?)
java.lang.NullPointerException
        at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.spawnEntity(CraftWorld.java
:336)
        at com.gmail.gkovalechyn.mspawn.SpawnHandler.cleanUp(SpawnHandler.java:9
7)
        at com.gmail.gkovalechyn.mspawn.SpawnHandler.create(SpawnHandler.java:38
)
        at com.gmail.gkovalechyn.mspawn.MSpawn.onEnable(MSpawn.java:53)
        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(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.v1_4_R1.CraftServer.loadPlugin(CraftServer.jav
a:282)
        at org.bukkit.craftbukkit.v1_4_R1.CraftServer.enablePlugins(CraftServer.
java:264)
        at net.minecraft.server.v1_4_R1.MinecraftServer.j(MinecraftServer.java:3
21)
        at net.minecraft.server.v1_4_R1.MinecraftServer.e(MinecraftServer.java:3
00)
        at net.minecraft.server.v1_4_R1.MinecraftServer.a(MinecraftServer.java:2
59)
        at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.jav
a:149)
        at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java
:399)
        at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:8
49)
>