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playing modded minecraft and tried to go to the aether dimension and it suddenly just said "shutting down internal server" and closed.. heres the crash report please help me identify which mod is causing the problem

---- Minecraft Crash Report ----
// You're mean.

Time: 4/16/15 9:19 AM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at net.minecraft.client.network.NetHandlerPlayClient.func_147281_a(NetHandlerPlayClient.java:745)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:97)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:15)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2049)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at net.minecraft.client.network.NetHandlerPlayClient.func_147281_a(NetHandlerPlayClient.java:745)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:97)
at net.minecraft.network.play.server.S0FPacketSpawnMob.func_148833_a(SourceFile:15)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Adfabz'/398, l='MpServer', x=105.50, y=36.62, z=856.50]]
Chunk stats: MultiplayerChunkCache: 10, 19
Level seed: 0
Level generator: ID 05 - BIOMESOP, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-146,64,820), Chunk: (at 14,4,4 in -10,51; contains blocks -160,0,816 to -145,255,831), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
Level time: 162901 game time, 162901 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [EntityClientPlayerMP['Adfabz'/398, l='MpServer', x=105.50, y=36.62, z=856.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2432)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:916)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_31, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 239133488 bytes (228 MB) / 542334976 bytes (517 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 97
FML: MCP v9.05 FML v7.10.104.1360 Minecraft Forge 10.13.3.1360 Optifine OptiFine_1.7.10_HD_U_B5 37 mods loaded, 37 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.104.1360} [Forge Mod Loader] (forge-1.7.10-10.13.3.1360-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.3.1360} [Minecraft Forge] (forge-1.7.10-10.13.3.1360-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.4.35} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.3.74} [Not Enough Items] (Not-Enough-Items-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
<CoFH ASM>{000} [CoFH ASM] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ThreadedLighting{1.7.10-1.0} [Threaded Lighting] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
gilded-games-util{1.7.10-1.1} [Gilded Games Utility] (gilded-games-util.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{6.14} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.14.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Treecapitator{1.7.2} [Treecapitator] ([1.7.2]Treecapitator-universal-2.0.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
aether{Alpha 1.7.10-1.3} [Aether II] (aether.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
alluwant{2.1} [All U Want] (All-U-Want 2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
iChunUtil{4.0.0} [iChunUtil] (iChunUtil-4.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Grinder{4.0.0} [Grinder] (AttachableGrinder-4.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
betterstorage{0.10.0.112-dev} [BetterStorage] (BetterStorage-1.7.10-0.10.1.113.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BetterTitleScreen{1.7.10-1.1} [Better Title Screen] (BetterTitleScreen-1.7.10-1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.10.2} [BiblioCraft] (BiblioCraft[v1.10.2][MC1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1019-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore{1.7.10R3.0.2} [CoFH Core] (CoFHCore-[1.7.10]3.0.2-262.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.4.11} [BuildCraft] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.4.11} [BC Transport] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.4.11} [BC Silicon] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.4.11} [BC Builders] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.4.11} [BC Energy] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.4.11} [BC Factory] (buildcraft-6.4.11.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
eureka{3.0.1} [Eureka] (Eureka-1.7.10-3.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bcadditions{2.1.2} [BuildCraft Additions] (BuildcraftAdditions-1.7.10-2.1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cse{1.0} [Craftable Spawn Eggs] (cse-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cubeworld{3.2AF} [Cube World] (CubeWorldV3.1BF (Minecraft V1.7.10).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{5.1.0} [Lucky Block] (Lucky-Block-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
moreplayermodels{1.7.10b} [MorePlayerModels] (MorePlayerModels_1.7.10b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
stefinusguns{0.5.2} [New Stefinus Guns] (Stefinus Guns-0.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThermalFoundation{1.7.10R1.0.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.0.0-81.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThermalExpansion{1.7.10R4.0.1} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.1-182.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TrailMix{4.0.0} [TrailMix] (TrailMix-4.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore: -[1.7.10]3.0.2-262
ThermalFoundation: -[1.7.10]1.0.0-81
ThermalExpansion: -[1.7.10]4.0.1-182
Launched Version: 1.7.10-Forge10.13.3.1360-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GT 555M/PCIe/SSE2 GL version 4.5.0 NVIDIA 350.12, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)