Mo' Creatures Not Working?

[Laura Mars]

Okay so I was watching some videos on how to install Mo' Creatures into my FTB, and I did exactly what every single one told me to do (which was all the same thing). After the Mojang Minecraft sign would go by I would get a black screen.
And I kept getting this:
2013-03-20 22:04:45 [INFO] [STDERR] Exception in thread "Minecraft main thread" java.lang.NoSuchMethodError: net.minecraftforge.common.EnumHelper.addArmorMaterial(Ljava/lang/String;I[II)Lsd;
2013-03-20 22:04:45 [INFO] [STDERR] at drzhark.mocreatures.MoCreatures.<clinit>(MoCreatures.java:75)
2013-03-20 22:04:45 [INFO] [STDERR] at java.lang.Class.forName0(Native Method)
2013-03-20 22:04:45 [INFO] [STDERR] at java.lang.Class.forName(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:418)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268)
2013-03-20 22:04:45 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:153)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at java.lang.reflect.Method.invoke(Unknown Source)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
2013-03-20 22:04:45 [INFO] [STDERR] at com.google.common.eventbus.EventBus.post(EventBus.java:268)
2013-03-20 22:04:45 [INFO] [STDERR] at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:86)
2013-03-20 22:04:45 [INFO] [STDERR] at cpw.mods.fml.common.Loader.loadMods(Loader.java:494)
2013-03-20 22:04:45 [INFO] [STDERR] at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:161)
2013-03-20 22:04:45 [INFO] [STDERR] at net.minecraft.client.Minecraft.a(Minecraft.java:412)
2013-03-20 22:04:45 [INFO] [STDERR] at asq.a(SourceFile:56)
2013-03-20 22:04:45 [INFO] [STDERR] at net.minecraft.client.Minecraft.run(Minecraft.java:746)
2013-03-20 22:04:45 [INFO] [STDERR] at java.lang.Thread.run(Unknown Source)

I have no idea what that is. And I tried putting the GuiApi and CustomMobSpawner in the JarMods, CoreMods, or Mods folder to see if maybe that was the problem, but it wasn't.
And I took out the Mo' Creatures mod to see if that was the problem, and obviously it is.

Is there any way I could fix this?

 

[Bassereus]

I too am having this problem! What are you using Windows or Mac? I'm on a mac and it doesn't work but running the exact same way of installing works fine! Its only MoCreatures that stops working for me too. I really hope this gets fixed soon

 

[Ashzification]

I too am having this problem! What are you using Windows or Mac? I'm on a mac and it doesn't work but running the exact same way of installing works fine! Its only MoCreatures that stops working for me too. I really hope this gets fixed soon

You're probably installing it wrong.
Follow the regular installation instructions for the mod. Instead of placing the mod in your vanilla Minecraft folder, place it in your modpack\minecraft\mods folder.