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I figured this would be the place to go for this, if not, let me know. I have no idea what's going on here.

Ticking entity

java.lang.ArrayIndexOutOfBoundsException: 452
at net.minecraft.entity.monster.EntityEnderman.func_70636_d(EntityEnderman.java:166)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1685)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:227)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(SourceFile:30)
at net.minecraft.world.World.func_72866_a(World.java:2101)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:674)
at net.minecraft.world.World.func_72870_g(World.java:2064)
at WorldServerOF.func_72870_g(WorldServerOF.java:394)
at net.minecraft.world.World.func_72939_s(World.java:1916)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:512)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:657)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:568)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:705)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at net.minecraft.entity.monster.EntityEnderman.func_70636_d(EntityEnderman.java:166)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1685)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:227)
at net.minecraft.entity.monster.EntityMob.func_70071_h_(SourceFile:30)
at net.minecraft.world.World.func_72866_a(World.java:2101)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:674)
at net.minecraft.world.World.func_72870_g(World.java:2064)
at WorldServerOF.func_72870_g(WorldServerOF.java:394)

-- Entity being ticked --
Details:
Entity Type: Enderman (net.minecraft.entity.monster.EntityEnderman)
Entity ID: 281247
Entity Name: Enderman
Entity's Exact location: 32.45, 34.00, 47.19
Entity's Block location: World: (32,34,47), Chunk: (at 0,2,15 in 2,2; contains blocks 32,0,32 to 47,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1916)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:512)

-- Affected level --
Details:
Level name: Ageless
All players: 1 total; [EntityPlayerMP['BearAK'/218, l='Ageless', x=56.29, y=40.00, z=146.41]]
Chunk stats: ServerChunkCache: 521 Drop: 0
Level seed: -7117623523899358506
Level generator: ID 06 - TMBislands, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (33,64,170), Chunk: (at 1,4,10 in 2,10; contains blocks 32,0,160 to 47,255,175), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 24189 game time, 24189 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 17793 (now: true), thunder time: 82989 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:657)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:568)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:705)

-- System Details --
Details:
Minecraft Version: 1.7.2
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 184215320 bytes (175 MB) / 514396160 bytes (490 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 1151 (64456 bytes; 0 MB) allocated, 800 (44800 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 14
FML: MCP v9.01-pre FML v7.2.116.1024 Minecraft Forge 10.12.0.1024 Optifine OptiFine_1.7.2_HD_D1 19 mods loaded, 18 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.2.116.1024} [Forge Mod Loader] (forge-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.12.0.1024} [Minecraft Forge] (forge-1.7.2-10.12.0.1024.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
battlegear2{1.0.5.3} [Mine & Blade Battlegear 2 - Bullseye] (1.7.2-MB_Battlegear2-Bullseye-1.0.5.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ChickenShed{1.1.3} [Chicken Shed] ([1.7.2] ChickenShed (v1.1.3).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
asielib{0.2.0} [asielib] (AsieLib-0.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bcmod{1.7.2 - 2.3.2} [BCMod (Brad16840.Common mod)] (bcmod 1.7.2 - 2.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
backpacks16840{1.7.2 - 2.3.2} [Backpacks!] (backpacks 1.7.2 - 2.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.6.3} [BiblioCraft] (BiblioCraft[1.6.3][MC1.7.2].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
chisel{1.5.3} [Chisel] (chisel-1.5.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.6.8.1} [CraftGuide] (CraftGuide-1.6.8.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
wuppy29_harderpeaceful{1.7.2} [Harder Peaceful] (Harder Peaceful 1.7.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MapWriter{2.1.1} [MapWriter] (MapWriter-1.7.2-2.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mediccraft{1.7.2 - 0.9.2} [MedicCraft] (MedicCraft-1.7.2 - 0.9.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
pplus{1.7.2} [Peaceful Plus] (Peaceful Plus [1.7.2].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
wuppy29_peacefulpack{1.1.7.1} [Peacefulpack] (PeacefulPack 1.1.7.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooManyBiomes{1.2.3} [Too Many Biomes] (TooManyBiomes-1.7.2-v-1.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
weaponmod{1.7.2 v1.14.2} [Balkon's WeaponMod] (weaponmod-1.14.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
asielibcore{} [AsieLib CoreMod] (minecraft.jar) Unloaded->Disabled
Profiler Position: N/A (disabled)
Vec3 Pool Size: 572 (32032 bytes; 0 MB) allocated, 393 (22008 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['BearAK'/218, l='Ageless', x=56.29, y=40.00, z=146.41]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Looks like a problem with endermen and/or the server you were on. Plus, Balkon's Weapon mod and AsieLib dont seem to be loading correctly.

Hope this helped,
Max