Bukkit

This error happens per-player. I made sure to turn off any natural creature spawning for this world.

The world is being used as my parkour world as well as my spawn world and multiverse portal station. This plugin is necessary to keep the world running.

Also, every hour or so the gravity turns back to normal, then re-enables after about 10 mins. Very annoying for the people in the parkour arenas.

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1:01:07 PM [SEVERE] Could not pass event CreatureSpawnEvent to bSpace vv2.3.2-dev
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:256)
at net.minecraft.server.v1_5_R3.World.addEntity(World.java:956)
at net.minecraft.server.v1_5_R3.SpawnerCreature.spawnEntities(SpawnerCreature.java:183)
at net.minecraft.server.v1_5_R3.WorldServer.doTick(WorldServer.java:190)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:554)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:235)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
at me.iffa.bspace.listeners.spout.SpaceSpoutEntityListener.onCreatureSpawn(SpaceSpoutEntityListener.java:90)
at sun.reflect.GeneratedMethodAccessor125.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 13 more
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here is my list of plugins:

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2:03:28 PM [INFO] Durasara issued server command: /plugins
2:03:29 PM [INFO] Plugins (55): VoxelSniper, Multiverse-Core, AngryWolves, SkylandsPlus, OpenInv, CleanroomGenerator, SimpleBackup, Multiverse-NetherPortals, PermissionsBukkit, Spout, InfoGuide, BOSEconomy, More Blocks, ZombieApocalypse, ZavAutoMessager, MoreMaterials, Essentials, Multiverse-Portals, dynmap, PaintedStone, bSpace, mmoCore, EssentialsChat, WorldEdit, EssentialsProtect, EssentialsSpawn, Dynmap-Essentials, mmoInfo, mmoInfoArmor, EssentialsAntiBuild, mmoInfoCoords, mmoInfoXP, mmoInfoFood, mmoInfoCompass, mmoPet, mmoChat, mmoInfoOnline, mmoDamage, mmoInfoTime, mmoInfoWorld, SpoutEssentials, mmoTarget, mmoParty, mmoInfoHealth, mmoChatTitle, mmoInfoTicks, Factions, Dynmap-Factions, Vault, QuickShop, WirelessRedstone, LWC, mmoInfoGold, ApiPlus, GunsPlus
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If you want you can send me a PM or email. (my email is in my profile) I will also gladly test new builds. Unfortunately I am not fluent in Java, so I can't walk myself through the API myself.