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I installed Mo'Creatures today, used all of the most recent files (Forge, GUI, MobSpawner, Mo'Creatures) and followed the directions exactly. This is the only currently installed mod, although there are traces of other mods in the config file (The game runs, I can open previously created worlds and also create new worlds. The mod is there, I can see all of the animal spawners, I've even been able to play the game with the animals for about 60 seconds. Then it crashes with this crash log:


---- Minecraft Crash Report ----
// Why did you do that?

Time: 4/6/13 12:30 PM
Description: Ticking player

java.lang.IllegalArgumentException
at net.minecraft.util.WeightedRandom.func_76273_a(SourceFile:17)
at net.minecraft.util.WeightedRandom.func_76271_a(SourceFile:31)
at drzhark.customspawner.CustomSpawner.getRandomCustomMob(CustomSpawner.java:869)
at drzhark.customspawner.CustomSpawner.doCustomSpawning(CustomSpawner.java:368)
at drzhark.mocreatures.MoCServerTickHandler.onTickInGame(MoCServerTickHandler.java:45)
at drzhark.mocreatures.MoCServerTickHandler.tickEnd(MoCServerTickHandler.java:117)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPlayerPostTick(FMLCommonHandler.java:389)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:403)
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:319)
at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:308)
at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:134)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


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

-- Head --
Stacktrace:
at net.minecraft.util.WeightedRandom.func_76273_a(SourceFile:17)
at net.minecraft.util.WeightedRandom.func_76271_a(SourceFile:31)
at drzhark.customspawner.CustomSpawner.getRandomCustomMob(CustomSpawner.java:869)
at drzhark.customspawner.CustomSpawner.doCustomSpawning(CustomSpawner.java:368)
at drzhark.mocreatures.MoCServerTickHandler.onTickInGame(MoCServerTickHandler.java:45)
at drzhark.mocreatures.MoCServerTickHandler.tickEnd(MoCServerTickHandler.java:117)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPlayerPostTick(FMLCommonHandler.java:389)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:403)

-- Player being ticked --
Details:
Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
Entity ID: 10
Entity Name: MyBestKids
Entity's Exact location: -260.50, 68.00, 257.50
Entity's Block location: World: (-261,68,257), Chunk: (at 11,4,1 in -17,16; contains blocks -272,0,256 to -257,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:319)
at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:308)
at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:134)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_43, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 363355872 bytes (346 MB) / 554369024 bytes (528 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 1580 (88480 bytes; 0 MB) allocated, 1580 (88480 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.44 FML v5.1.13.624 Minecraft Forge 7.7.1.624 6 mods loaded, 6 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GuiAPI [GuiAPI] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner [DrZhark's CustomSpawner] (CustomMobSpawner 1-1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v5) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 23 (1288 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['MyBestKids'/10, l='mo creatures world', x=-260.50, y=68.00, z=257.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

i got the same error. except i'm on windows. can anyone help?

Yes, I have the same experience. I have a solve but ticking repeats. And I play with my daughter, I open my single game to LAN and she joins. We've played mocreatures, milenaire, Flan guns mods, with forge, but now, while we are both flying Bat Horses, it crashes to 'ticking player' thing. Also I did fix it when it crashed my world previously via MC Edit! I moved the player location, the 'player move' and the named player location icon in MCEDit and that seems to get it going, but then it crashes now again.