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Whenever I play minecraft with all the mods its fine, then after a couple of minutes I lag extremely and then minecraft shuts down. Here is the crash report, please help me asap

Here are the mods that I am using,

• -Grimoire Of Gaia
• -Lucky Blocks
• -SpaceCore
• -CodeChickenLib
• Ars Magica 2
• AnimationAPI
• Arcan Scrolls
• Backpack Mod
• Battletower
• BUtterflyMania
• Carpenterblocks
• ChickenChunks
• CoFHCore
• DragonMounts
• DukeCore
• ExtraBiomesXL
• Fossil and Archaeology: Jurassic Park
• MagicalCrops
• Rei's Minimap
• MrCrayFish furniture
• Optifine
• Thaumcraft
• ThermalExpansion
• Waila
• SurvivalWings
• Witchery

---- Minecraft Crash Report ----
// I let you down. Sorry

Time: 9/12/14 6:20 AM
Description: Exception in server tick loop

java.lang.IllegalAccessError: tried to access field net.minecraft.server.management.PlayerInstance.field_73263_b from class codechicken.chunkloader.ChunkLoaderManager
at codechicken.chunkloader.ChunkLoaderManager.cleanChunks(ChunkLoaderManager.java:844)
at codechicken.chunkloader.ChunkLoaderManager.tickEnd(ChunkLoaderManager.java:862)
at codechicken.chunkloader.ChunkLoaderEventHandler.tickEnd(ChunkLoaderEventHandler.java:39)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:282)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:677)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Mac OS X (x86_64) version 10.9.4
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 224208416 bytes (213 MB) / 650641408 bytes (620 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -Xmx1024m -XX:MaxPermSize=128m
AABB Pool Size: 3206 (179536 bytes; 0 MB) allocated, 2870 (160720 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 v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_C6 37 mods loaded, 37 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] (modpack.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.965} [Minecraft Forge] (modpack.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AM2-Preloader{0.0.1} [AMCore] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems-1.6.4-1.6.1.9-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GrimoireGaia2{1.8.2} [§2Grimoire of Gaia 2] ([1-3) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{4.2.1} [Lucky Block] ([1-6-4]_Lucky_Block_v4-2-1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SC0_SpaceCore{0.6.2} [SpaceCore] ([1.6.4] SpaceCore 0.6.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AnimationAPI{1.1.1} [AnimationAPI] (AnimationAPI v1.1.2 mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
arsmagica2{1.2.0.022} [Ars Magica 2] (AM2_1.2.0.022-2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DC1{2.3.1.11} [DukeCore] (Dukecore-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AS1{2.4.2.18} [Arcane Scrolls] (Arcane-Scrolls-Mod-1.6.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Backpack{1.28.37} [Backpack] (backpack-1.28.37-1.6.x (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BackToTheRoots{0.9.3.1} [Butterfly Mania] (butterflymania[1.6.4]_universal_v0.9.3.1 (2).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CarpentersBlocks{2.1.0} [Carpenter's Blocks] (carpentersblocks v2.1.0 - MC 1.6+.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ChickenChunks{1.3.3.4} [ChickenChunks] (ChickenChunks-1.6.4-1.3.3.4-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore{2.0.0.5} [CoFH Core] (CoFHCore-2.0.0.5 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHLoot{2.0.0.5} [CoFH Loot] (CoFHCore-2.0.0.5 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHMasquerade{2.0.0.5} [CoFH Masquerade] (CoFHCore-2.0.0.5 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHSocial{2.0.0.5} [CoFH Social] (CoFHCore-2.0.0.5 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHWorld{2.0.0.5} [CoFH World] (CoFHCore-2.0.0.5 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DragonMounts{r36} [Dragon Mounts] (dragonmount_r36_mc1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtrabiomesXL{3.15.8} [ExtrabiomesXL] (ExtrabiomesXL-universal-1.6.4-3.15.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
fossil{1.6.4 Build 6.3} [Fossils and Archeology Revival] (Fossils_Archeology_Revival-1.6.4_Build-6.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
magicalcrops{3.2.1} [Magical Crops] (magical_crops_1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
standardcrops{1.1.0} [Magical Crops - Crops & Food] (magical_crops_1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] (minimap) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{3.3.4} [MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.3.4(1.6.4).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Thaumcraft{4.1.0g} [Thaumcraft] (Thaumcraft4) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMultipart{1.0.0.219} [Forge Multipart] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThermalExpansion{3.0.0.7} [Thermal Expansion] (ThermalExpansion-3.0.0.7 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Waila{1.5.0} [Waila] (Waila_1.5.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SC0_Wings{1.2.4} [Survival Wings] (wings) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
witchery{0.19.2} [Witchery] (witchery-1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
McMultipart{1.0.0.219} [Minecraft Multipart Plugin] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMicroblock{1.0.0.219} [Forge Microblocks] (ForgeMultipart-universal-1.6.4-1.0.0.219.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 880 (49280 bytes; 0 MB) allocated, 721 (40376 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Cr8tive_Zone'/277, l='CubeMagica', x=328.42, y=58.00, z=255.21]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'