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So I put, ArchemidiesShips,AlienVsPredator, AIRI.jar(forAliensVs.Predator),battlegear 2, render API player forge, AssissansCraft, Mutant Creatures, and Animation API into the mods folder. I tried to create a world but it crashed. Any help would be great!
Here is the crash report (first part)

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 9/15/13 5:36 PM
Description: Rendering screen

java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityOtherPlayerMP
at net.minecraft.client.Minecraft.continueWorldLoading(Minecraft.java:2047)
at net.minecraft.client.Minecraft.func_71371_a(Minecraft.java:2010)
at net.minecraft.client.gui.GuiSelectWorld.func_74064_e(SourceFile:157)
at net.minecraft.client.gui.GuiWorldSlot.func_77213_a(SourceFile:210)
at net.minecraft.client.gui.GuiSlot.func_77211_a(GuiSlot.java:247)
at net.minecraft.client.gui.GuiSelectWorld.func_73863_a(SourceFile:183)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1036)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:944)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:57)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityOtherPlayerMP
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 16 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 65536
at org.objectweb.asm.ClassReader.a(Unknown Source)
at org.objectweb.asm.ClassReader.b(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer.transform(DeobfuscationTransformer.java:39)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:267)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:165)
... 18 more