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HELP!?!?!?!?!?!? I am trying to mod Minecraft 1.6.2 but everytime I go into a world it crashes my Minecraft!!!!!!!!!!!!!!!!!!!

Here is the crash report:



---- Minecraft Crash Report ----
// Why is it breaking

Time: 11/13/14 2:18 PM
Description: Updating screen events

java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityOtherPlayerMP
at net.minecraft.client.Minecraft.continueWorldLoading(Minecraft.java:2047)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2010)
at net.minecraft.client.gui.GuiSelectWorld.func_74064_e(SourceFile:157)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:122)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:69)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:128)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:107)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1564)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
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:57)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityOtherPlayerMP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 65536
at org.objectweb.asm.ClassReader.a(Unknown Source)
at org.objectweb.asm.ClassReader.b(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at codechicken.lib.asm.ASMHelper.createClassNode(ASMHelper.java:114)
at codechicken.lib.asm.ASMHelper.createClassNode(ASMHelper.java:107)
at codechicken.lib.asm.ClassHeirachyManager.declareASM(ClassHeirachyManager.java:146)
at codechicken.lib.asm.ClassHeirachyManager.transform(ClassHeirachyManager.java:165)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:267)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:165)
... 19 more


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

-- Head --
Stacktrace:
at net.minecraft.client.Minecraft.continueWorldLoading(Minecraft.java:2047)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2010)
at net.minecraft.client.gui.GuiSelectWorld.func_74064_e(SourceFile:157)
at net.minecraft.client.gui.GuiSelectWorld.func_73875_a(SourceFile:122)
at net.minecraft.client.gui.GuiScreen.func_73864_a(SourceFile:69)
at net.minecraft.client.gui.GuiScreen.func_73867_d(SourceFile:128)
at net.minecraft.client.gui.GuiScreen.func_73862_m(SourceFile:107)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.GuiMainMenu
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1564)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
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:57)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)

-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 49822792 bytes (47 MB) / 230686720 bytes (220 MB) up to 523501568 bytes (499 MB)
JVM Flags: 7 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Xmx512m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.04 FML v6.2.62.871 Minecraft Forge 9.10.1.871 Optifine OptiFine_1.6.2_HD_U_C4 9 mods loaded, 9 mods active
mcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.2.62.871} [Forge Mod Loader] (minecraftforge-9.10.1.871.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.10.1.871} [Minecraft Forge] (minecraftforge-9.10.1.871.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.9.0.5} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.6.1.3} [Not Enough Items] (NotEnoughItems-1.6_1.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
battlegear2{1.0.1} [Mine & Blade Battlegear 2 - Warcry] (1.6.2-MB_Battlegear2-Warcry-1.0.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.4_01 [1.6.2]} [mod_ReiMinimap] ([1.6.2]ReiMinimap_v3.4_01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.56} [Inventory Tweaks] (InventoryTweaks-MC1.6.2-1.56-b77 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.2.0} [Morph] (Morph-Beta-0.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.6.2-Forge9.10.1.871
LWJGL: 2.9.0
OpenGL: ATI Mobility Radeon HD 4200 Series GL version 3.3.11672 Compatibility Profile Context, 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: ~~ERROR~~ NullPointerException: null