Here is an error and i don't know how to fix it. I hope it helps you fix it up.
2013-01-09 14:28:47 [iNFO] Starting minecraft server version 1.4.6
2013-01-09 14:28:53 [iNFO] Loading properties
2013-01-09 14:28:53 [iNFO] Default game type: SURVIVAL
2013-01-09 14:28:53 [iNFO] Generating keypair
2013-01-09 14:28:54 [iNFO] Starting Minecraft server on *:25585
2013-01-09 14:28:55 [WARNING] Failed to load white-list: java.io.FileNotFoundException: .\white-list.txt (The system cannot find the file specified)
2013-01-09 14:28:55 [iNFO] Preparing level "Void Map"
2013-01-09 14:28:56 [iNFO] Preparing start region for level 0
2013-01-09 14:28:56 [iNFO] Done (0.537s)! For help, type "help" or "?"
2013-01-09 14:28:57 [iNFO] Bukkit version format changed. Version not checked.
2013-01-09 14:28:57 [iNFO] git-BukkitForge-1.4.5-R1.0-b3000 jnks (Really: BukkitForge for MC 1.4.6)
2013-01-09 14:28:57 [iNFO] 1.4.5-R0.2
2013-01-09 14:28:57 [FINE] Aborting ItemSpawnBL read, itemDB not yet loaded.
2013-01-09 14:28:57 [iNFO] Essentials: Using GroupManager based permissions.
2013-01-09 14:28:58 [sEVERE] Encountered an unexpected exception t
t: Ticking entity
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:685)
at ho.r(DedicatedServer.java:270)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)
Caused by: java.lang.NullPointerException
at keepcalm.mods.bukkit.bukkitAPI.entity.BukkitEntity.getEntity(BukkitEntity.java:220)
at keepcalm.mods.bukkit.forgeHandler.ForgeEventHandler.onLivingAttack(ForgeEventHandler.java:180)
at net.minecraftforge.event.ASMEventHandler_60_ForgeEventHandler_onLivingAttack_LivingAttackEvent.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:35)
at net.minecraftforge.event.EventBus.post(EventBus.java:103)
at net.minecraftforge.common.ForgeHooks.onLivingAttack(ForgeHooks.java:342)
at md.a(EntityLiving.java:993)
at md.y(EntityLiving.java:580)
at lq.j_(Entity.java:431)
at md.j_(EntityLiving.java:808)
at qo.j_(EntitySlime.java:109)
at yc.a(World.java:2295)
at in.a(WorldServer.java:647)
at yc.g(World.java:2257)
at yc.h(World.java:2103)
at in.h(WorldServer.java:516)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
... 4 more