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My Minecraft was Working and now It keep's Crashing My Minecraft Is Modded

Crash
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---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 5/3/14 3:09 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: thehippomaster/MutantCreatures/MutantSkeleton
at cpw.mods.fml.common.LoadController.transition(LoadController.java:156)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:700)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:249)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:509)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:808)
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)
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 org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:214)
at org.multimc.EntryPoint.listen(EntryPoint.java:165)
at org.multimc.EntryPoint.main(EntryPoint.java:54)
Caused by: java.lang.NoClassDefFoundError: thehippomaster/MutantCreatures/MutantSkeleton
at thehippomaster.MutantCreatures.ChemicalX.<clinit>(ChemicalX.java:76)
at thehippomaster.MutantCreatures.MutantCreatures.init(MutantCreatures.java:95)
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:545)
at sun.reflect.GeneratedMethodAccessor2.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:201)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:181)
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:112)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:699)
... 17 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.MutantCreatures.MutantSkeleton
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 45 more
Caused by: java.lang.NoClassDefFoundError: thehippomaster/AnimationAPI/IAnimatedEntity
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:178)
... 47 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.AnimationAPI.IAnimatedEntity
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:97)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 51 more


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 (x86) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 363612032 bytes (346 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -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 v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_D1 17 mods loaded, 17 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized
CodeChickenCore{0.9.0.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
NotEnoughItems{1.6.1.9} [Not Enough Items] (NotEnoughItems 1.6.1.9.jar) Unloaded->Constructed->Pre-initialized->Initialized
PlayerAPI{1.1} [Player API] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
RenderPlayerAPI{1.0} [Render Player API] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
bspkrsCore{v5.3(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev5.3.zip) Unloaded->Constructed->Pre-initialized->Initialized
tm{1.0} [Pattys More Tools Mod] ([1.6.4]PattysMoreTools.zip) Unloaded->Constructed->Pre-initialized->Initialized
TreeCapitator{Forge 1.6.4.r09} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r09.Universal.zip) Unloaded->Constructed->Pre-initialized->Initialized
iChunUtil{2.4.0} [iChunUtil] (util^iChunUtil2.4.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
MobAmputation{2.0.1} [MobAmputation] (files^MobAmputation2.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized
FlansMod{4.1.1} [Flans Mod] (FlansMod-4.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized
LotsOfFood{1.6.4} [Lots of Food] (Lots of Food 1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
MutantCreatures{1.4.4} [Mutant Creatures] (Mutant_Creatures_v1.4.4_mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Errored
mod_SmartMoving{14.6} [Smart Moving] (Smart Moving Universal for ModLoader or Minecraft Forge or MCPC+.zip) Unloaded->Constructed->Pre-initialized->Initialized
mod_SmartRender{1.1} [Smart Render] (Smart Moving Universal for ModLoader or Minecraft Forge or MCPC+.zip) Unloaded->Constructed->Pre-initialized->Initialized

Looks like you forgot to get the animation API for mutant creatures. Here's the link from the forum post. Download it and add it to your mods folder.
http://adf.ly/377779/animationapi-v112-mc164

For future reference, at the bottom of your crash log, you will see mods that load. If one says errored, look at the crash log above. If it says "java.lang.NoClassDefFoundError" then it means you didnt get a required API file.

Thank you So Much I've Been So confused with this