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So, I downloaded MultiMC and MCForge. Then I downloaded a handfull of mods. I start up the game, everything runs smoothly with no issues. Then, the dreaded crash when I enter the Nether. I don't know what to do. I've looked and looked and looked over the crash report to try and figure it out. But I STILL can't figure it out. Please, someone help me. I have included the crash report below.









---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 12/6/12 7:16 AM
Description: Failed to start game

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: mod_PortableWorkbench
at cpw.mods.fml.common.LoadController.transition(LoadController.java:117)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:479)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:151)
at net.minecraft.client.Minecraft.a(Minecraft.java:424)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: mod_PortableWorkbench
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:141)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.ModClassLoader.loadBaseModClass(ModClassLoader.java:87)
at cpw.mods.fml.common.modloader.ModLoaderModContainer.constructMod(ModLoaderModContainer.java:488)
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:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140)
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:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:478)
... 4 more
Caused by: java.lang.NullPointerException
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:134)
... 32 more


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

-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 465620240 bytes (444 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
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 v7.23 FML v4.5.11.470 Minecraft Forge 6.4.1.413 11 mods loaded, 11 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML [Forge Mod Loader] (coremods) Unloaded->Constructed
Forge [Minecraft Forge] (coremods) Unloaded->Constructed
mod_GuiAPI [mod_GuiAPI] (minecraft.jar) Unloaded->Constructed
craftguide [CraftGuide] (CraftGuide-1.6.5.11.zip) Unloaded->Constructed
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v4.3.0.zip) Unloaded->Constructed
mod_MovePlus [mod_MovePlus] (moveplus v2.2 for MC v1.4.5.zip) Unloaded->Constructed
mod_PortableWorkbench [mod_PortableWorkbench] (PortableWorkbench (1.1.0).zip) Unloaded->Errored
mod_Timber [Timber!] (Timber! (1.4.4).zip) Unloaded->Constructed
weaponmod [Balkon's WeaponMod] (Weaponmod.zip) Unloaded->Constructed
WirelessRedstoneCore [Wireless Redstone] (WirelessRedstone.zip) Unloaded->Constructed
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 6320 Graphics GL version 4.1.10825 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Soartex Fanver.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null