I am experiencing crashes with the Grim Pack installed. In particular the following error was generated when the Advanced Ray Gun hit a zombie. I have also seen this error in travels around the world when certain chunks load.

Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at net.minecraft.network.datasync.EntityDataManager.func_187225_a(SourceFile:116)
at net.minecraft.entity.projectile.EntityArrow.func_70241_g(SourceFile:555)
at org.blockartistry.mod.DynSurround.client.DamageEffectHandler.onLivingHurt(DamageEffectHandler.java:119)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_583_DamageEffectHandler_onLivingHurt_LivingHurtEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:72)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraftforge.common.ForgeHooks.onLivingHurt(ForgeHooks.java:502)
at net.minecraft.entity.EntityLivingBase.func_70665_d(EntityLivingBase.java:1296)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:890)
at net.minecraft.entity.monster.EntityMob.func_70097_a(SourceFile:73)
at net.minecraft.entity.monster.EntityZombie.func_70097_a(EntityZombie.java:284)
at com.grim3212.mc.pack.core.entity.EntityProjectile.func_184549_a(EntityProjectile.java:336)
at com.grim3212.mc.pack.core.entity.EntityProjectile.func_70071_h_(EntityProjectile.java:261)
at com.grim3212.mc.pack.tools.entity.EntityRayw.func_70071_h_(EntityRayw.java:41)
at net.minecraft.world.World.func_72866_a(World.java:1964)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:838)
at net.minecraft.world.World.func_72870_g(World.java:1934)
at net.minecraft.world.World.func_72939_s(World.java:1750)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:619)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at net.minecraft.network.datasync.EntityDataManager.func_187225_a(SourceFile:116)
at net.minecraft.entity.projectile.EntityArrow.func_70241_g(SourceFile:555)
at org.blockartistry.mod.DynSurround.client.DamageEffectHandler.onLivingHurt(DamageEffectHandler.java:119)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_583_DamageEffectHandler_onLivingHurt_LivingHurtEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:72)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraftforge.common.ForgeHooks.onLivingHurt(ForgeHooks.java:502)
at net.minecraft.entity.EntityLivingBase.func_70665_d(EntityLivingBase.java:1296)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:890)
at net.minecraft.entity.monster.EntityMob.func_70097_a(SourceFile:73)
at net.minecraft.entity.monster.EntityZombie.func_70097_a(EntityZombie.java:284)
at com.grim3212.mc.pack.core.entity.EntityProjectile.func_184549_a(EntityProjectile.java:336)
at com.grim3212.mc.pack.core.entity.EntityProjectile.func_70071_h_(EntityProjectile.java:261)
at com.grim3212.mc.pack.tools.entity.EntityRayw.func_70071_h_(EntityRayw.java:41)
at net.minecraft.world.World.func_72866_a(World.java:1964)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:838)
at net.minecraft.world.World.func_72870_g(World.java:1934)

-- Entity being ticked --
Details:
Entity Type: grimpack.AdvRayShot (com.grim3212.mc.pack.tools.entity.EntityAdvRayw)
Entity ID: 23131577
Entity Name: entity.grimpack.AdvRayShot.name
Entity's Exact location: 8.81, 4.23, 19.61
Entity's Block location: World: (8,4,19), Chunk: (at 8,0,3 in 0,1; contains blocks 0,0,16 to 15,255,31), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 2.96, -0.29, -0.09
Entity's Passengers: []
Entity's Vehicle: ERROR NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1750)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:619)

-- Affected level --
Details:
Level name: Mining World
All players: 1 total; [EntityPlayerMP['ScottoMotto'/386, l='Mining World', x=5.82, y=3.00, z=19.70]]
Chunk stats: ServerChunkCache: 303 Drop: 0
Level seed: -3267801913639114808
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 3;minecraft:bedrock,230_minecraft:stone,5_minecraft:dirt,minecraft:grass;3;biome_1,decoration,stronghold,mineshaft,dungeon
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 3510332 game time, 3510332 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 7127 (now: true), thunder time: 8831 (now: true)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:240)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)