Tengo un problema con el mod Backpack que antes tenía la versión 2.0.0 del mod para la 1.7.2 y me funcionaba bien, pero luego me di cuenta de que no se podía equipar la mochila ni estaba la backpack workbench entonces me descargé la 2.0.1 del mod para la 1.7.2 porque se supone que la habían actualizado, pero al instalarla se crasheaba. Les dejo el reporte del crash:

—- Minecraft Crash Report —-
// Hi. I’m Minecraft, and I’m a crashaholic.

Time: 28-11-14 03:09 PM
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: cpw/mods/fml/client/event/ConfigChangedEvent$OnConfigChangedEvent
at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:288)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:527)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:815)
at net.minecraft.client.main.Main.main(SourceFile:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: cpw/mods/fml/client/event/ConfigChangedEvent$OnConfigChangedEvent
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2668)
at java.lang.Class.privateGetPublicMethods(Class.java:2786)
at java.lang.Class.getMethods(Class.java:1607)
at cpw.mods.fml.common.eventhandler.EventBus.register(EventBus.java:47)
at de.eydamos.backpack.proxy.ClientProxy.registerHandlers(ClientProxy.java:27)
at de.eydamos.backpack.Backpack.init(Backpack.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:208)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:187)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:690)
… 10 more
Caused by: java.lang.ClassNotFoundException: cpw.mods.fml.client.event.ConfigChangedEvent$OnConfigChangedEvent
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
… 43 more
Caused by: java.lang.NullPointerException

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

— System Details —
Details:
Minecraft Version: 1.7.2
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.8.0-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 86496328 bytes (82 MB) / 446169088 bytes (425 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.03 FML v7.2.211.1121 Minecraft Forge 10.12.2.1121 Optifine OptiFine_1.7.2_HD_U_D1 42 mods loaded, 42 mods active
mcp{9.03} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{7.2.211.1121} [Forge Mod Loader] (forge-1.7.2-10.12.2.1121.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forge{10.12.2.1121} [Minecraft Forge] (forge-1.7.2-10.12.2.1121.jar) Unloaded->Constructed->Pre-initialized->Initialized
CodeChickenCore{1.0.2.10} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
NotEnoughItems{1.0.2.14} [Not Enough Items] (NotEnoughItems-1.7.2-1.0.2.14-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized
DamageIndicatorsMod{3.1.1} [Damage Indicators] ([1.7.2]DamageIndicatorsMod-3.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
bspkrsCore{6.11} [bspkrsCore] ([1.7.2]bspkrsCore-universal-6.11.jar) Unloaded->Constructed->Pre-initialized->Initialized
Treecapitator{1.7.2} [Treecapitator] ([1.7.2]Treecapitator-universal-2.0.3.jar) Unloaded->Constructed->Pre-initialized->Initialized
deconstruction{2.1.0} [The Deconstruction Mod] ([MC1.7.2]Deconstruction[v2.1.0].jar) Unloaded->Constructed->Pre-initialized->Initialized
advancedgenetics{1.5.6} [Advanced Genetics] (advancedgenetics-1.5.6-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized
AnimationAPI{1.2.1} [AnimationAPI] (AnimationAPI-1.7.2-1.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar) Unloaded->Constructed->Pre-initialized->Errored
bcmod{1.7.2 – 2.2.0} [BCMod (Brad16840.Common mod)] (bcmod 1.7.2 – 2.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BiblioCraft{1.8.2} [BiblioCraft] (BiblioCraft[v1.8.2][MC1.7.2].jar) Unloaded->Constructed->Pre-initialized->Initialized
ChestTransporter{1.1.8} [Chest Transporter] (ChestTransporter-1.1.8-MC1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
CustomSpawner{3.2.0.dev.R1} [DrZhark’s CustomSpawner] (CustomMobSpawner 3.2.0-DEV-R2.zip) Unloaded->Constructed->Pre-initialized->Initialized
MoCreatures{6.2.0.dev.R1} [DrZhark’s Mo’Creatures Mod] (DrZharks MoCreatures Mod v6.2.0-DEV-R2.zip) Unloaded->Constructed->Pre-initialized->Initialized
DungeonPack{1.7.2-2.0} [DungeonPack] (DungeonPack-1.7.2-2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
eplus{1.7.2-2.0.4} [Enchanting Plus] (EnchantingPlus-1.7.2-2.0.4.jar) Unloaded->Constructed->Pre-initialized->Initialized
flansmod{4.3.0} [Flan’s Mod] (Flans Mod-1.7.2-4.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
FreezeCam{3.5} [FreezeCam] (FreezeCam-3.5.jar) Unloaded->Constructed->Pre-initialized->Initialized
GraveStone{2.9.0} [GraveStone] (GraveStone 2.9.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
ani_koto{v1.5.5} [Kingdoms of the Overworld Mod] (Kingdoms of the Overworld-1.7.2-1.5.5.jar) Unloaded->Constructed->Pre-initialized->Initialized
mod_LATL{1.9} [Lamps and Traffic lights] (LampsAndTrafficLights-1.1-Minecraft_1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
radixcore{1.2.0} [RadixCore] (RadixCore-1.2.0 MC-1.7.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
mca{4.0.4} [Minecraft Comes Alive] (MCA-4.0.4 MC-1.7.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
mythril{1.6} [Mythril mod] (mithril_mod-1.7.2-1.6.jar) Unloaded->Constructed->Pre-initialized->Initialized
morehealth{5.5} [More Health Forge] (More Health Enhanced-1.7.2-5.5.zip) Unloaded->Constructed->Pre-initialized->Initialized
cfm{3.3.5} [§6MrCrayfish’s Furniture Mod] (MrCrayfishFurnitureModv3.3.5(1.7.2).jar) Unloaded->Constructed->Pre-initialized->Initialized
MutantCreatures{1.4.5} [Mutant Creatures] (MutantCreatures-1.7.2-1.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized
ObsidianBoat{v1.3.2} [Obsidian Boat] (ObsidianBoat-1.7.2-1.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
opalsplus{1.7.2.6} [Opalsplus] (opalsplus-1.7.2.5-F1085.jar) Unloaded->Constructed->Pre-initialized->Initialized
progressiveautomation{1.3.0} [Progressive Automation] (ProgressiveAutomation-1.7.2-1.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
quiverchevsky{b56} [QuiverBow] (QuiverBow_1.7.2_b56.zip) Unloaded->Constructed->Pre-initialized->Initialized
mod_RoadWorks{2.0} [Roadworks] (RoadWorks-2.0-Minecraft_1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
rpginventorymod{1.7.2} [Rpg Inventory] (RpgInventory-1.7.2_1.12.jar) Unloaded->Constructed->Pre-initialized->Initialized
simpleportables{@VERSION@} [Simple Portables] (simpleportables-0.6.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
TragicMC{1.28.1055 Beta} [TragicMC 2] (TragicMC2-1.7.2-1.28.1055.jar) Unloaded->Constructed->Pre-initialized->Initialized
voxelmap{1.7.2} [VoxelMap] (voxelmap-1.7.2-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
warpbook{1.0.35} [Warp Book] (warp-book-1.7.2-1.0.35.jar) Unloaded->Constructed->Pre-initialized->Initialized
xpStorageChest{1.0.0} [XP Storage Chest] (XPStorageChest-1.7.2-1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
Baubles{1.0.0.13} [Baubles] (Baubles-1.7.2-1.0.0.13.jar) Unloaded->Constructed->Pre-initialized->Initialized