Error

2013-03-10 05:01:27 [SEVERE] net.minecraft.server.v1_4_R1.ReportedException: Loading entity NBT
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.Entity.e(Entity.java:1221)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.EntityTypes.a(SourceFile:122)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ChunkRegionLoader.loadEntities(ChunkRegionLoader.java:333)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ChunkRegionLoader.a(ChunkRegionLoader.java:49)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ChunkProviderServer.loadChunk(ChunkProviderServer.java:177)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:106)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:85)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getChunkAt(CraftWorld.java:117)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:81)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_R1.CraftWorld.getBlockAt(CraftWorld.java:481)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.Location.getBlock(Location.java:82)
2013-03-10 05:01:27 [SEVERE] 	at blainicus.MonsterApocalypse.MonsterApocalypse$torchdestroyer.run(MonsterApocalypse.java:2251)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftTask.run(CraftTask.java:53)
2013-03-10 05:01:27 [SEVERE] 	at org.bukkit.craftbukkit.v1_4_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:530)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
2013-03-10 05:01:27 [SEVERE] Caused by: java.lang.NullPointerException
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.NBTTagCompound.getInt(SourceFile:125)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.EntityZombie.a(EntityZombie.java:210)
2013-03-10 05:01:27 [SEVERE] 	at net.minecraft.server.v1_4_R1.Entity.e(Entity.java:1160)
2013-03-10 05:01:27 [SEVERE] 	... 18 more