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When I load certain worlds in MineCraft, minecraft crashes with this error report. I play modded MineCraft 1.6.4 on a windows 7 computer. I have tons of mods installed, but some worlds do still work. Any fixes for this?
Error Report:

---- Minecraft Crash Report ----
// My bad.

Time: 22/03/14 3:28 PM
Description: Unexpected error

java.lang.NullPointerException
at net.minecraft.client.renderer.ItemRenderer.func_78446_a(ItemRenderer.java:600)
at net.minecraft.client.renderer.ItemRenderer.func_78447_b(ItemRenderer.java:551)
at net.minecraft.client.renderer.EntityRenderer.func_78476_b(EntityRenderer.java:720)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1296)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1006)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)
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.renderer.ItemRenderer.func_78446_a(ItemRenderer.java:600)
at net.minecraft.client.renderer.ItemRenderer.func_78447_b(ItemRenderer.java:551)
at net.minecraft.client.renderer.EntityRenderer.func_78476_b(EntityRenderer.java:720)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1296)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [GCCorePlayerSP['brad0423'/403546, l='MpServer', x=0.73, y=64.79, z=0.90]]
Chunk stats: MultiplayerChunkCache: 95
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (354,64,106), Chunk: (at 2,4,10 in 22,6; contains blocks 352,0,96 to 367,255,111), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 3123597 game time, 186364 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: 2 total; [GCCoreEntityRocketT1['Tier 1 Rocket'/403547, l='MpServer', x=-6.50, y=64.80, z=0.50], GCCorePlayerSP['brad0423'/403546, l='MpServer', x=0.73, y=64.79, z=0.90]]
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 (amd64) version 6.1
Java Version: 1.7.0_40, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 412083872 bytes (392 MB) / 954728448 bytes (910 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 37859 (2120104 bytes; 2 MB) allocated, 25 (1400 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 6, tallocated: 70
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 50 mods loaded, 50 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->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->Available->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->Available->Available->Available->Available->Available
BetterSprinting{v11} [Better Sprinting (core)] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
CodeChickenCore{0.9.0.6} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
NotEnoughItems{1.6.1.5} [Not Enough Items] (NotEnoughItems_1.61.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
PowerCrystalsCore{1.1.8} [PowerCrystals Core] (PowerCrystals-Core-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct-Preloader{0.0.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
SPCForge{1.1} [SPC Forge] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AnimatedPlayer{1.3.0} [Animated Player Mod] (Animated_Player_v1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AnimationAPI{1.1.1} [AnimationAPI] (AnimationAPI-v1.1.1-mc1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ArchimedesShipsMod{1.6.2 v1.4.4} [Archimedes' Ships] (Archimedes-Ships-Mod-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
bspkrsCore{v5.2(1.6.4)} [bspkrsCore] (HUD Core) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ArmorStatusHUD{v1.15(1.6.4)} [ArmorStatusHUD] (Armor HUD) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
amm{2.2} [ArmorMovementMod] (ArmorMovement-1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BiblioCraft{1.5.3} [BiblioCraft] (BiblioCraft[v1.5.3].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Core{4.2.1} [BuildCraft] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Builders{4.2.1} [BC Builders] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Energy{4.2.1} [BC Energy] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Factory{4.2.1} [BC Factory] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Transport{4.2.1} [BC Transport] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Silicon{4.2.1} [BC Silicon] (buildcraft-A-1.6.4-4.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
CloneCraft{1.2} [CloneCraft] (CloneCraft_v2.0_MC1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
DamageIndicatorsMod{2.9.2.2} [Damage Indicators] (Damage Indicators) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ImmibisCore{57.1.7} [Immibis Core] (immibis-core-57.1.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
DimensionalAnchors{57.1.7} [Dimensional Anchors] (dimensional-anchor-57.1.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
StatusEffectHUD{v1.19(1.6.4)} [StatusEffectHUD] (Effects HUD) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ExtraUtilities{1.0.1} [Extra Utilities] (extrautils-1.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
GalacticraftCore{2.0.8} [Galacticraft Core] (Galacticraft-1.6.4-2.0.8.908.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
GalacticraftMars{2.0.8} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.8.908.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
planetguy_Gizmos{2.2} [Gizmos] (Gizmos_v2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
iChunUtil{2.3.0} [iChunUtil] (iChunUtil2.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Mocap{0.6} [Motion Capture] (mocap-0.6(1.6.4).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
MutantCreatures{1.4.4} [Mutant Creatures] (Mutant_Creatures_v1.4.4_mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Mystcraft{0.10.12.00} [Mystcraft] (mystcraft-uni-1.6.4-0.10.12.00.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
OB{1.0.1 RELEASE} [Orbital Bombardment] (OrbitalBombardment_Pre1.0.2-1.6.4) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
PortalGun{2.0.1} [PortalGun] (PortalGun2.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] (Rei's Minimap) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
SlimevoidLib{2.0.3.1} [Slimevoid Library] (SlimevoidLib-Universal-v2.0.3.1_(MC1.6.4).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Sync{2.1.1} [Sync] (Sync2.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct{1.6.X_1.5.0d} [Tinkers' Construct] (TConstruct_1.6.4_1.5.0d9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct|ForgeMuliPart{0.1} [TConstruct Compat: FMP] (TConstruct_1.6.4_1.5.0d9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct|CompatMineFactoryReloaded{0.2} [TConstruct Compat: MFR] (TConstruct_1.6.4_1.5.0d9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct|NotEnoughItems{0.1} [TConstruct Compat: NEI] (TConstruct_1.6.4_1.5.0d9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct|CompatWaila{0.0.1} [TConstruct Compat: Waila] (TConstruct_1.6.4_1.5.0d9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
WirelessRedstoneCore{1.7.1.4} [Wireless Redstone] (WirelessRedstoneCore-Universal-v1.7.1.4_MC1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
WirelessCamouflager{1.0} [Wireless Redstone - Wireless Camouflager] (WirelessRedstone_Camouflager-Universal-v1.0_MC1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
WirelessRemote{2.1} [Wireless Redstone - Wireless Remote] (WirelessRemote-Universal-v2.1_MC1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
TConstruct Environment: Sane and ready for action. Bugs may be reported.
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: GeForce GT 630/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
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: 164 (9184 bytes; 0 MB) allocated, 164 (9184 bytes; 0 MB) used