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Whenever I enter the nether, I get the dirt screen that says "shutting down internal server...", and then I crash. This used to not happen before. Mods I have currently installed are: Divine RPG, Treecapitiator, Damage Indicators, Not Enough Items, and their respective support files. Any help would be much appreciated. This is the crash report.

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 10/2/13 4:46 PM
Description: Exception in world tick

java.lang.NullPointerException
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:952)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1928)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:952)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Lichosa'/369, l='MpServer', x=34.48, y=40.62, z=60.45]]
Chunk stats: MultiplayerChunkCache: 30
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 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: 21045 game time, 21045 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 4 total; [EntityHellBat['Hell Bat'/2564, l='MpServer', x=77.01, y=45.00, z=48.50], EntityClientPlayerMP['Lichosa'/369, l='MpServer', x=34.48, y=40.62, z=60.45], EntityPigZombie['Zombie Pigman'/2640, l='MpServer', x=90.50, y=41.00, z=48.50], EntityHellBat['Hell Bat'/2632, l='MpServer', x=59.50, y=37.00, z=58.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1941)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Lichosa'/369, l='MpServer', x=34.48, y=40.62, z=60.45]]
Chunk stats: MultiplayerChunkCache: 30
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 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: 21045 game time, 21045 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 4 total; [EntityHellBat['Hell Bat'/2564, l='MpServer', x=77.01, y=45.00, z=48.50], EntityClientPlayerMP['Lichosa'/369, l='MpServer', x=34.48, y=40.62, z=60.45], EntityPigZombie['Zombie Pigman'/2640, l='MpServer', x=90.50, y=41.00, z=48.50], EntityHellBat['Hell Bat'/2632, l='MpServer', x=59.50, y=37.00, z=58.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Non-integrated multiplayer server

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 267921008 bytes (255 MB) / 540409856 bytes (515 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 649 (36344 bytes; 0 MB) allocated, 36 (2016 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.11 FML v6.4.6.884 Minecraft Forge 9.11.0.884 9 mods loaded, 9 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.4.6.884} [Forge Mod Loader] (minecraftforge-9.11.0.884.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.11.0.884} [Minecraft Forge] (minecraftforge-9.11.0.884.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
CodeChickenCore{0.9.0.6} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
NotEnoughItems{1.6.1.5} [Not Enough Items] (NotEnoughItems 1.6.1.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_bspkrsCore{v3.05(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev3.05 (1).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
DamageIndicatorsMod{2.9.0.9} [Damage Indicators] (1.6.4 DamageIndicators v2.9.0.9.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
TreeCapitator{Forge 1.6.4.r02} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r02.Universal (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
DivineRPG{1.4.0 Beta!} [Divine RPG] (DivineRPG 1.6.2 Beta 5.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: 1.6.4-Forge9.11.0.884
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4000 GL version 3.3.0 - Build 8.15.10.2656, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Traditional_Beauty_162v4.zip
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 843 (47208 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used

Okay. Thank you. I figured it was that :T