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This is a nice mod.

Never mind.

I got this..

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 3/16/15 4:07 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:162)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:515)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:239)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867)
at net.minecraft.client.main.Main.main(SourceFile:148)
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: thehippomaster/MutantCreatures/MutantSkeleton
at thehippomaster.MutantCreatures.item.ChemicalX.<clinit>(ChemicalX.java:83)
at thehippomaster.MutantCreatures.MutantCreatures.preInit(MutantCreatures.java:89)
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.GeneratedMethodAccessor5.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
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.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:118)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:513)
... 10 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.MutantCreatures.MutantSkeleton
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 38 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:180)
... 40 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.AnimationAPI.IAnimatedEntity
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:99)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 44 more

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

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 116797152 bytes (111 MB) / 308002816 bytes (293 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 v9.05 FML v7.10.25.1205 Minecraft Forge 10.13.0.1205 Optifine OptiFine_1.7.10_HD_B5 20 mods loaded, 20 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{7.10.25.1205} [Forge Mod Loader] (forge-1.7.10-10.13.0.1205.jar) Unloaded->Constructed->Pre-initialized
Forge{10.13.0.1205} [Minecraft Forge] (forge-1.7.10-10.13.0.1205.jar) Unloaded->Constructed->Pre-initialized
CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized
itemphysic{1.1.2} [ItemPhysic] (minecraft.jar) Unloaded->Constructed->Pre-initialized
NotEnoughItems{1.0.3.74} [Not Enough Items] (Not-Enough-Items-1.7.10.jar) Unloaded->Constructed->Pre-initialized
DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3.jar) Unloaded->Constructed->Pre-initialized
IMSM{100.0.2} [IMSM] ([1.7.10]InstantMassiveStructuresMod.jar) Unloaded->Constructed->Pre-initialized
Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar) Unloaded->Constructed->Pre-initialized
bettervillages{0.4} [Better Villages Mod] (BetterVillages-0.4(1.7.10).jar) Unloaded->Constructed->Pre-initialized
diversity{ALPHA 1.5} [Diversity] (Diversity-1.7.10-Alpha-1.5.jar) Unloaded->Constructed->Pre-initialized
MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) Unloaded->Constructed->Pre-initialized
iChunUtil{4.1.3} [iChunUtil] (iChun-Util-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized
lucky{5.1.0} [Lucky Block] (Lucky-Block-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized
Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar) Unloaded->Constructed->Pre-initialized
MutantCreatures{1.4.8} [Mutant Creatures] (MutantCreatures-1.7.10-1.4.8.jar) Unloaded->Constructed->Errored
ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized
rivalrebels{1.7.10D} [Rival Rebels] (rivalrebels-1.7.10D.jar) Unloaded->Constructed->Pre-initialized
TConstruct{1.7.10-1.6.0.build611} [Tinkers' Construct] (TConstruct_mc1.7.10_1.6.0d40.1.jar) Unloaded->Constructed->Pre-initialized
TooMuchTNT{2.9} [TooMuchTNT] (TooMuchTNT v2.9.jar) Unloaded->Constructed->Pre-initialized
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
TConstruct Environment: Environment healthy.