Minecraft mod crash!

So, I've been installing some mods on a world to celebrate my birthday wich comes soon with my friends, and I installed a mod, it didn't work and I deleted it, and then, my world I was working on crashes, giving me the report below, please help me! Thank you.

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 3/22/14 12:11 PM
Description: Unexpected error

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.Minecraft.func_71407_l(Minecraft.java:1967)
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)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['n0name85'/189, l='MpServer', x=226.01, y=85.62, z=421.18]]
Chunk stats: MultiplayerChunkCache: 9
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (228,64,256), Chunk: (at 4,4,0 in 14,16; contains blocks 224,0,256 to 239,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 333640 game time, 472938 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: 18 total; [EntityNPCHumanFemale['Korra'/305, l='MpServer', x=242.50, y=63.00, z=424.50], EntityCannon['entity.weaponmod.cannon.name'/304, l='MpServer', x=243.34, y=64.00, z=426.03], EntityNPCHumanMale['Alex'/201, l='MpServer', x=224.93, y=84.00, z=430.18], EntityClientPlayerMP['n0name85'/189, l='MpServer', x=226.01, y=85.62, z=421.18], EntityNPCHumanFemale['Coco'/200, l='MpServer', x=236.07, y=84.00, z=416.50], EntityNPCHumanMale['Ion'/191, l='MpServer', x=230.50, y=63.00, z=425.50], EntityPainting['Painting'/197, l='MpServer', x=225.00, y=89.00, z=423.94], EntityLeashKnot['entity.LeashKnot.name'/334, l='MpServer', x=230.50, y=63.50, z=420.50], EntityNPCVillager['Aram Haciaturian'/196, l='MpServer', x=237.50, y=84.00, z=419.50], EntityPainting['Painting'/197, l='MpServer', x=225.00, y=89.00, z=423.94], EntityPainting['Painting'/198, l='MpServer', x=228.00, y=89.00, z=423.94], EntityPainting['Painting'/199, l='MpServer', x=227.00, y=88.50, z=418.06], EntityPainting['Painting'/198, l='MpServer', x=228.00, y=89.00, z=423.94], EntityPainting['Painting'/199, l='MpServer', x=227.00, y=88.50, z=418.06], EntityHorse['Horse'/193, l='MpServer', x=226.00, y=63.88, z=419.34], EntityNPCHumanMale['Taz'/192, l='MpServer', x=225.50, y=63.00, z=425.50], EntityNPCHumanMale['Paul'/195, l='MpServer', x=227.34, y=78.00, z=421.05], EntityNPCHumanMale['Andrei'/194, l='MpServer', x=230.12, y=63.00, z=430.26]]
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_71396_d(Minecraft.java:2312)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:863)
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)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 135070424 bytes (128 MB) / 328007680 bytes (312 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 140 (7840 bytes; 0 MB) allocated, 140 (7840 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_C7 18 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{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
ImmibisMicroblocks{57.2.3} [Immibis's Microblocks] (Immibiss-Microblocks-Mod-1.6.4.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
custom_flags{1.3.1} [Custom Flags] ([1.6.2] Custom Flags - 1.3.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{v5.2(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TreeCapitator{Forge 1.6.4.r09} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r09.Universal.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
basicgunsmod{2.1.0} [BasicGunsMod] (BasicGunsMod 1.6.4 v1.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
customnpcs{1.6.4} [CustomNpcs] (CustomNPCs_1.6.2-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ImmibisCore{57.1.4} [Immibis Core] (Immibis-Core-1.6.4.jar) 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
MapWriter{2.0} [MapWriter] (mapwriter-2.0.11.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
tuxweapons{0.6} [TuxWeapons] (TuxWeapons-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
weaponmod{1.6.2 v1.13.6} [Balkon's WeaponMod] (WeaponMod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
YALSM{2.0.3} [Yet Another Leather Smelting Mod] (yalsm-2.0.3.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: Radeon X1550 Series GL version 2.1.8545 Release, ATI Technologies Inc.
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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used