Hola, bueno mi problema es que el backpacks es incompatible con mis otros mods, lo tengo a minecraft ya con forge y todo, pero se crashea igual los mods que tengo son estos (junto al backpack q se crashea):
http://prntscr.com/7wxa51

Y el reporte:
—- Minecraft Crash Report —-
// I just don’t know what went wrong 🙁

Time: 25/07/15 16:21
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$OnConfigChangedEvent
at cpw.mods.fml.common.LoadController.transition(LoadController.java:162)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:691)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:288)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:527)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:815)
at net.minecraft.client.main.Main.main(SourceFile:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.NoClassDefFoundError: cpw/mods/fml/client/event/ConfigChangedEvent$OnConfigChangedEvent
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetPublicMethods(Unknown Source)
at java.lang.Class.getMethods(Unknown Source)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
… 43 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:180)
… 45 more

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 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: 200641040 bytes (191 MB) / 422572032 bytes (402 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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 34 mods loaded, 34 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
PlayerAPI{1.4} [Player API] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
SmartCore{1.0} [Smart Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct-Preloader{0.1.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
battlegear2{1.0.5.5} [Mine & Blade Battlegear 2 – Bullseye] (1.7.2-MB_Battlegear2-Bullseye-1.0.5.5.jar) Unloaded->Constructed->Pre-initialized->Initialized
DamageIndicatorsMod{3.1.2} [Damage Indicators] (14140610159_Damage-Indicators-Mod-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar) Unloaded->Constructed->Pre-initialized->Errored
BiblioCraft{1.8.2} [BiblioCraft] (BiblioCraft[v1.8.2][MC1.7.2].jar) Unloaded->Constructed->Pre-initialized->Initialized
chocolateQuest{0.0} [Chocolate Quest] (chocolateQuest-1.7.2-BETA.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights{1.3.4} [Dynamic Lights] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_onFire{1.0.4} [Dynamic Lights Burning Entity Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_dropItems{1.0.7} [Dynamic Lights EntityItem Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_mobEquipment{1.0.5} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_floodLights{1.0.1} [Dynamic Lights Flood Light] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_otherPlayers{1.0.7} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
eplus{1.7.2-2.0.3.1} [Enchanting Plus] (EnchantingPlus-1.7.2-2.0.3.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
enderutilities{0.1.1} [Ender Utilities] (enderutilities-1.7.2-0.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
inventorytweaks{1.58-147-645ca10} [Inventory Tweaks] (InventoryTweaks-1.58-147.jar) Unloaded->Constructed->Pre-initialized->Initialized
LotsOfFood{1.7.2} [Lots of Food] (Lots of Food-1.7.2 v7.jar) Unloaded->Constructed->Pre-initialized->Initialized
Mantle{1.7.2-132.45b0b50} [Mantle] (Mantle-1.7.2-0.2.8.jar) Unloaded->Constructed->Pre-initialized->Initialized
SmartMoving{15.0.1} [Smart Moving] (SmartMoving-1.7.2-15.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
SmartRender{2.0} [Smart Render] (SmartRender-1.7.2-2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
TConstruct{1.7.2-1.6.0.jenkins478} [Tinkers’ Construct] (TConstruct-1.7.2-1.6.0.a14.jar) Unloaded->Constructed->Pre-initialized->Initialized
AS_UpdateCheck{1.1.5} [AtomicStryker Update Check Mod] (UpdateCheckerMod-1.7.2.jar) Unloaded->Constructed->Pre-initialized->Initialized
voxelmap{1.7.2} [VoxelMap] (voxelmap-1.7.2-1.0.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
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.

Les Agradeceria mucho la ayuda gracias