I keep getting a crash whenever I load up my game with OpenBlocks and OpenModsLib installed. I've also been having the same problem with the new version of ExtraUtils.

If there is any other information needed, let me know, this is my first on GitHub, so will be a little confused as to rules etc.

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 17/02/14 15:47
Description: There was a severe problem during mod loading that has caused the game to fail

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraftforge/client/ClientCommandHandler
at cpw.mods.fml.common.LoadController.transition(LoadController.java:149)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:521)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:181)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:471)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:806)
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)
Caused by: java.lang.NoClassDefFoundError: net/minecraftforge/client/ClientCommandHandler
at openmods.proxy.OpenClientProxy.preInit(OpenClientProxy.java:99)
at openmods.OpenMods.preInit(OpenMods.java:48)
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:540)
at sun.reflect.GeneratedMethodAccessor1.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:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:194)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:174)
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:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:313)
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:105)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:520)
... 10 more
Caused by: java.lang.ClassNotFoundException: net.minecraftforge.client.ClientCommandHandler
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 38 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: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_20, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 196479848 bytes (187 MB) / 516882432 bytes (492 MB) up to 2863333376 bytes (2730 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
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: 0, tallocated: 0
FML: MCP v8.11 FML v6.4.3.883 Minecraft Forge 9.11.0.883 Optifine OptiFine_1.6.4_HD_U_C7 28 mods loaded, 28 mods active
mcp{8.09} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized
FML{6.4.3.883} Forge Mod Loader Unloaded->Constructed->Pre-initialized
Forge{9.11.0.883} Minecraft Forge Unloaded->Constructed->Pre-initialized
CodeChickenCore{0.9.0.7} CodeChicken Core Unloaded->Constructed->Pre-initialized
NotEnoughItems{1.6.1.8} [Not Enough Items](NotEnoughItems 1.6.1.8.jar) Unloaded->Constructed->Pre-initialized
OpenModsCore{0.2} OpenModsCore Unloaded->Constructed->Pre-initialized
barrels{3.3.2} [The Barrels Mod](Barrels 3.3.2 - 1.6.4.jar) Unloaded->Constructed->Pre-initialized
BiblioCraft{1.5.4} BiblioCraft Unloaded->Constructed->Pre-initialized
CoFHCore{2.0.0.2} CoFH Core Unloaded->Constructed->Pre-initialized
CoFHLoot{2.0.0.2} CoFH Loot Unloaded->Constructed->Pre-initialized
CoFHMasquerade{2.0.0.2} CoFH Masquerade Unloaded->Constructed->Pre-initialized
CoFHSocial{2.0.0.2} CoFH Social Unloaded->Constructed->Pre-initialized
CoFHWorld{2.0.0.2} CoFH World Unloaded->Constructed->Pre-initialized
ComputerCraft{1.58} ComputerCraft Unloaded->Constructed->Pre-initialized
CCTurtle{1.58} ComputerCraft Turtles Unloaded->Constructed->Pre-initialized
EnderStorage{1.4.3.5} [EnderStorage](EnderStorage 1.4.3.5.jar) Unloaded->Constructed->Pre-initialized
ExtraUtilities{1.0.1} Extra Utilities Unloaded->Constructed->Pre-initialized
inventorytweaks{1.56} Inventory Tweaks Unloaded->Constructed->Pre-initialized
IronChest{5.4.1.649} Iron Chest Unloaded->Constructed->Pre-initialized
numina{0.1.1-53} Numina Unloaded->Constructed->Pre-initialized
powersuits{0.9.0-76} MachineMuse's Modular Powersuits Unloaded->Constructed->Pre-initialized
OpenMods{0.2} OpenMods Unloaded->Constructed->Errored
OpenBlocks{1.2.5} OpenBlocks Unloaded->Constructed->Errored
ForgeMultipart{1.0.0.219} Forge Multipart Unloaded->Constructed->Pre-initialized
ThermalExpansion{3.0.0.2} Thermal Expansion Unloaded->Constructed->Pre-initialized
Redstone Arsenal{1.0.0.0} Redstone Arsenal Unloaded->Constructed->Pre-initialized
McMultipart{1.0.0.219} Minecraft Multipart Plugin Unloaded->Constructed->Pre-initialized
ForgeMicroblock{1.0.0.219} Forge Microblocks Unloaded->Constructed->Pre-initialized

Hi,

Please update your minecraft forge to the latest recommended version and let me know if that sorts it out.

Nope, this didn't help... I am using Optifine, should this affect it?

I would update your Java version to 7.

Still no change....

Looks to me like your forge installation isn't right.
It can't find "net/minecraftforge/client/ClientCommandHandler", which should always be there.

I can't really consider this an OpenBlocks issue, especially if you're having trouble with extra utils too.

I recommend asking in #minecraftforge on esper.net for help