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Well i downloaded this mod called orespawn and the first time i played with my additional ,ods it went fine but when i logged out of the world and went back in it crashed if you need any more info just ask and here is the crash report. Windows computer with windows 8

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 5/14/14 7:50 PM
Description: Exception in world tick

java.lang.NullPointerException
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:956)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
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:1930)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
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:956)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['BaccaRedstone'/279, l='MpServer', x=-69.63, y=81.62, z=120.21]]
Chunk stats: MultiplayerChunkCache: 25
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (120,64,252), Chunk: (at 8,4,12 in 7,15; contains blocks 112,0,240 to 127,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 198183 game time, 216935 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: 9 total; [EntityBat['Bat'/354, l='MpServer', x=-82.75, y=44.91, z=87.13], EntityBat['Bat'/37, l='MpServer', x=-47.25, y=52.69, z=96.06], EntityItem['item.item.bone'/355, l='MpServer', x=-82.13, y=80.13, z=122.13], EntityBat['Bat'/350, l='MpServer', x=-111.31, y=15.81, z=121.53], EntityClientPlayerMP['BaccaRedstone'/279, l='MpServer', x=-69.63, y=81.62, z=120.21], EntityBat['Bat'/349, l='MpServer', x=-111.25, y=18.09, z=113.25], EntityCreeper['Creeper'/40, l='MpServer', x=-43.50, y=46.00, z=96.50], EntityBat['Bat'/348, l='MpServer', x=-109.47, y=17.09, z=115.25], EntityBat['Bat'/347, l='MpServer', x=-101.78, y=60.53, z=90.78]]
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:440)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1943)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:910)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
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['BaccaRedstone'/279, l='MpServer', x=-69.63, y=81.62, z=120.21]]
Chunk stats: MultiplayerChunkCache: 25
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (120,64,252), Chunk: (at 8,4,12 in 7,15; contains blocks 112,0,240 to 127,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 198183 game time, 216935 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: 9 total; [EntityBat['Bat'/354, l='MpServer', x=-82.75, y=44.91, z=87.13], EntityBat['Bat'/37, l='MpServer', x=-47.25, y=52.69, z=96.06], EntityItem['item.item.bone'/355, l='MpServer', x=-82.13, y=80.13, z=122.13], EntityBat['Bat'/350, l='MpServer', x=-111.31, y=15.81, z=121.53], EntityClientPlayerMP['BaccaRedstone'/279, l='MpServer', x=-69.63, y=81.62, z=120.21], EntityBat['Bat'/349, l='MpServer', x=-111.25, y=18.09, z=113.25], EntityCreeper['Creeper'/40, l='MpServer', x=-43.50, y=46.00, z=96.50], EntityBat['Bat'/348, l='MpServer', x=-109.47, y=17.09, z=115.25], EntityBat['Bat'/347, l='MpServer', x=-101.78, y=60.53, z=90.78]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server

-- System Details --
Details:
Minecraft Version: 1.6.4
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: 166830096 bytes (159 MB) / 411930624 bytes (392 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 157 (8792 bytes; 0 MB) allocated, 17 (952 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_U_D1 19 mods loaded, 19 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.9.2.3} [Damage Indicators] (1.6.4 DamageIndicatorsv2.9.2.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.4]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.28.37} [Backpack] (backpack-1.28.37-1.6.x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LegendaryBeasts{a1.6.4.0} [Legendary Beasts] (Forge_LegendaryBeastsAlpha1.6.4.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lom{102.0.4} [LotsOMobs] (LotsOMobs_102.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
dna{2.1} [dna] (LotsOMobs_102.0.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MinersDeluxe{2.2.3} [MinersDeluxe] (MinersDeluxe-v2.2.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoarOres{1.3.0} [MoarOres] (MoarOresV1.5.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.7.0} [Morph] (Morph-Beta-0.7.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
natureReborn{0.0.4} [Nature Reborn] (NatureReborn004.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OreSpawn{164.13} [OreSpawn] (orespawn164v13.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_SoManySwords{0.22} [mod_SoManySwords] (SMSv022.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
modteamcrafted{v2.2} [The Team Crafted Mod] (TeamCraftedMod_1.6.4-Olimation[2.7].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TwilightForest{1.20.3} [The Twilight Forest] (twilightforest-1.20.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2932, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 202 (11312 bytes; 0 MB) allocated, 19 (1064 bytes; 0 MB) usedAnd do any of the mods it shows i have in the crash report conflict with one another?

This happens when something is where it shouldn't be on a server, sometimes an entity, or blocks with physics.
Try either restarting the server, rolling it back to a past backup (If you have any) Or if nothing else works,
and you're willing to do this... Reset the worlds.

ok so i didnt have a backup so i found these mods that didnt work together so i just took them out and it was good.ok so i didnt have a backup so i found these mods that didnt work together so i just took them out and it was good.