Minecraft Forums

Hi all!

I am trying to install the Mutant Creatures mod from here.

I have downloaded Forge version 1.7.10 - 10.13.4.1558 which was the recommended version from here (I also tried 1.6.2 and 1.7.10 - 10.13.4.1614).

In my minecraft mods folder I have created a 1.7.10 subfolder. Inside the 1.7.10 folder I have MutantCreatures-1.7.10-1.4.9.jar and AnimationAPI-1.7.10-1.2.4 src.zip from here, which is required for the mutant creatures mod.

When I try to launch forge, it starts to load the mod but then crashes with the following:

The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
The game crashed whilst there was a severe problem during mod loading that has caused the game to fail
Error: cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: thehippomaster/MutantCreatures/MutantSkeleton

From what I have been able to google so far this may be a problem with how I installed AnimationAPI. I noticed on the download page it says "Please note the AnimationAPI must be installed in servers as well." Does this apply to SP use or is there something else I have to do to install AnimationAPI? I tried placing the zip folder in server-resource-packs as well as in my mods folder but this did not seem to help.

Any assistance getting this mod working, whether it is a problem with AnimationAPI or something else, would be very gratefully appreciated! I told my son I'd do my best to get it working for him but all I have managed so far is 2 hours of crashes and error messages.

Thanks for the reply, I ran through your steps to confirm.

1. Crash report is below

2. Yes I ran minecraft first using the 1.7.10 version

3. Forge seemed to install correctly, I have reinstalled twice to be sure

4. Yes, I set my profile to use the forge 1.7.10 version

5. Forge started correctly with no mods loaded

6. I placed the mods inside the mods folder, in a subfolder named 1.7.10

Crash report:

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

Time: 27/04/17 5:21 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:163)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:559)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:243)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:480)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
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:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:532)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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:212)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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:119)
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:556)
... 10 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.MutantCreatures.MutantSkeleton
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 39 more
Caused by: java.lang.NoClassDefFoundError: thehippomaster/AnimationAPI/IAnimatedEntity
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 41 more
Caused by: java.lang.ClassNotFoundException: thehippomaster.AnimationAPI.IAnimatedEntity
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 45 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 47 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 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 183296624 bytes (174 MB) / 287371264 bytes (274 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -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 v7.10.99.99 Minecraft Forge 10.13.4.1558 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCH mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCH FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCH Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCE MutantCreatures{1.4.9} [Mutant Creatures] (MutantCreatures-1.7.10-1.4.9.jar)
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 364.51' Renderer: 'GeForce GTX 960/PCIe/SSE2'

Thanks again. I moved both the mods to the minecraft mods folder (the files are AnimationAPI-1.7.10-1.2.4 src.zip and MutantCreatures-1.7.10-1.4.9.jar). Minecraft is still crashing with the same crash message :/ Could it be a version mismatch? I noticed the numbers after the 1.7.10 in the file names are different.

That was the problem! Using that version I am now able to load the mod without crashing. Thank you very much for the assistance.

Hey i know this is a year old post but im having issues. So i just recently downloaded the mutant creatures for the bunch of mods im using for my game, and i got the original Crash report and i saw this thread. I downloaded the non src version, December 12th realese and i got this message after i crashed

The game crashed whilst initializing game
The game crashed whilst initializing game
Error: java.lang.RuntimeException: No more entity indicies left

did i do something wrong?