Minecraft Forums

Hello all,

My daughter plays minecraft daily, and she uses the MoCreatures and Pixelmon mods... everything was working peachy until two days ago, and now the game crashes on startup- right past the Mojang logo. I honestly have no idea why, everything seems ok to me... can anyone help? Seems to be MoCreature related... but nothing should have changed at all.



---- Minecraft Crash Report ----
// Oops.

Time: 7/16/14 9:44 PM
Description: Initializing game

java.lang.IllegalArgumentException: Slot 701 is already occupied by [email protected] when adding [email protected]
at net.minecraft.block.Block.<init>(Block.java:349)
at net.minecraft.block.BlockFlower.<init>(BlockFlower.java:18)
at drzhark.mocreatures.block.MoCBlockTallGrass.<init>(MoCBlockTallGrass.java:27)
at drzhark.mocreatures.block.MoCBlockTallGrass.<init>(MoCBlockTallGrass.java:36)
at drzhark.mocreatures.MoCreatures.InitItems(MoCreatures.java:795)
at drzhark.mocreatures.MoCreatures.load(MoCreatures.java:364)
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.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.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)
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)


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

-- Head --
Stacktrace:
at net.minecraft.block.Block.<init>(Block.java:349)
at net.minecraft.block.BlockFlower.<init>(BlockFlower.java:18)
at drzhark.mocreatures.block.MoCBlockTallGrass.<init>(MoCBlockTallGrass.java:27)
at drzhark.mocreatures.block.MoCBlockTallGrass.<init>(MoCBlockTallGrass.java:36)
at drzhark.mocreatures.MoCreatures.InitItems(MoCreatures.java:795)
at drzhark.mocreatures.MoCreatures.load(MoCreatures.java:364)
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.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.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)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:249)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:509)

-- Initialization --
Details:
Stacktrace:
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)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_23, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 41568256 bytes (39 MB) / 409534464 bytes (390 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
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 6 mods loaded, 6 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
CustomSpawner{3.0.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
MoCreatures{6.1.0} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.1.0.zip) Unloaded->Constructed->Pre-initialized->Errored
pixelmon{3.0.4} [Pixelmon] (Pixelmon 3.0.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2266, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

Id conflict.

What's that mean? I admit I'm a newb.

Blocks and items (and a few other things) use an ID system. Each block gets an ID. Smooth stone is ID 1, wooden planks are 5, logs are 17, and so on. When mods add blocks, they need IDs too, and when two mods try to register their own blocks and they use the same ID, it will conflict, and you get a crash just like the one here.

To get around this issue, mods use a config file. In your minecraft folder, there's a config folder, and inside it, there is a config file for each mod. The config files let you change IDs, and other options. So to fix your error, you'll need to open the config file for the mod that's crashing, and change the IDs to something else that isn't being used by another mod.

java.lang.IllegalArgumentException: Slot 701 is already occupied by drzhark.mocreatures.block.MoCBlockLog@192277ed when adding drzhark.mocreatures.block.MoCBlockTallGrass@25ef757f

This means that slot 701 was being registered by 2 different blocks. In this case, "MoCBlockLog" and "MoCBlockTallGrass". So find those two IDs in the mo creatures config file, and change one of them to something that isn't being used.

Lastly, block IDs can go up to 4095, and item IDs can go up to 31999.