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I was hoping someone could tell me what this means. I just recently installed minecraft forge.

--- BEGIN ERROR REPORT 8d99bb6e --------
Full report at:
C:\Users\Owner\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-18_08.19.05-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 11/18/12 8:19 AM

-- System Details --
Details:
Minecraft Version: 1.4.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_32, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 397523088 bytes (379 MB) / 514523136 bytes (490 MB) up to 514523136 bytes (490 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdaterSmooth, ...[com.google.common.base.Preconditions, Charsets, Splitter, ...], [com.google.common.cache.CacheLoader, CacheBuilder, Cache, ...], [com.google.common.collect.Multimap, ListMultimap, AbstractMultimap, ...], [com.google.common.eventbus.EventBus, HandlerFindingStrategy, AnnotatedHandlerFinder, ...], [com.google.common.io.LineProcessor, Resources, InputSupplier, ...], [com.google.common.primitives.Ints], [com.google.common.reflect.TypeCapture, TypeToken, SimpleTypeToken, ...], [com.google.common.util.concurrent.UncheckedExecutionException, ExecutionError, MoreExecutors, ...], [cpw.mods.fml.client.ITextureFX, FMLTextureFX, TextureFXManager, ...], [cpw.mods.fml.client.modloader.ModLoaderClientHelper, ModLoaderKeyBindingHandler], [cpw.mods.fml.client.registry.ISimpleBlockRenderingHandler, KeyHandler, KeyBindingRegistry], [cpw.mods.fml.common.Loader, LoaderException, WrongMinecraftVersionException, ...], [cpw.mods.fml.common.asm.FMLSanityChecker, MLDetectorClassVisitor, SideOnly], [cpw.mods.fml.common.asm.transformers.AccessTransformer, Modifier, MarkerTransformer, ...], [cpw.mods.fml.common.discovery.ModDiscoverer, ASMDataTable, ModCandidate, ...], [cpw.mods.fml.common.discovery.asm.ASMModParser, ModClassVisitor, ModAnnotationVisitor, ...], [cpw.mods.fml.common.event.FMLLoadEvent, FMLEvent, FMLStateEvent, ...], [cpw.mods.fml.common.functions.ModIdFunction], [cpw.mods.fml.common.modloader.IModLoaderSidedHelper, ModLoaderHelper, ModLoaderVillageTradeHandler, ...], [cpw.mods.fml.common.network.Player, IPacketHandler, IConnectionHandler, ...], [cpw.mods.fml.common.registry.BlockProxy, ItemProxy, LanguageRegistry, ...], [cpw.mods.fml.common.toposort.ModSortingException, ModSorter, DirectedGraph, ...], [cpw.mods.fml.common.versioning.ArtifactVersion, VersionParser, InvalidVersionSpecificationException, ...], [net.minecraftforge.client.ForgeHooksClient, IItemRenderer], [net.minecraftforge.client.event.DrawBlockHighlightEvent, RenderWorldLastEvent, TextureLoadEvent], [net.minecraftforge.client.event.sound.SoundEvent, SoundResultEvent, PlayBackgroundMusicEvent, ...], [net.minecraftforge.common.IPlantable, IShearable, ISidedInventory, ...], [net.minecraftforge.event.Event, ListenerList, EventBus, ...], [net.minecraftforge.event.entity.EntityEvent, EntityJoinWorldEvent], [net.minecraftforge.event.entity.living.LivingEvent], [net.minecraftforge.event.entity.player.PlayerEvent, ArrowLooseEvent, ArrowNockEvent, ...], [net.minecraftforge.event.world.WorldEvent, Load, Save, ...], [net.minecraftforge.oredict.OreDictionary, OreRegisterEvent, ShapedOreRecipe, ...], [net.minecraftforge.transformers.ForgeAccessTransformer, EventTransformer], [org.objectweb.asm.ClassVisitor, ClassWriter, MethodVisitor, ...], [org.objectweb.asm.tree.ClassNode, MethodNode, FieldNode, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.21 FML v4.4.4.442 Minecraft Forge 6.3.0.372 Optifine OptiFine_1.4.4_HD_U_D1 4 mods loaded, 4 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML [Forge Mod Loader] (coremods) Unloaded->Constructed
Forge [Minecraft Forge] (coremods) Unloaded->Constructed
MutantCreatures [Mutant Creatures] (mutantcreatures) Unloaded->Errored
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 9.17.10.2843, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: mutantcreatures.MutantCreatures
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:150)
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: mutantcreatures.MutantCreatures
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.FMLModContainer.constructMod(FMLModContainer.java:410)
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 org.objectweb.asm.ClassReader.<init>(Unknown Source)
at net.minecraftforge.transformers.EventTransformer.transform(EventTransformer.java:29)
at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:178)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:133)
... 31 more
--- END ERROR REPORT 38324990 ----------