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Forge 1.12.1 with Mo Creatures mod. Minecraft loads fine, and I was able to create a new world, but as soon as that world loads it crashes. Graphics driver and Java both updated as of today. Mod added after updates.

Any help as to how to fix this is appreciated!

Here's the error log:

---- Minecraft Crash Report ----
// There are four lights!

Time: 9/17/17 2:28 PM
Description: Exception ticking world

java.lang.IllegalAccessError: tried to access field net.minecraft.world.biome.Biome.field_76791_y from class drzhark.mocreatures.MoCTools
at drzhark.mocreatures.MoCTools.biomeName(MoCTools.java:689)
at drzhark.mocreatures.entity.MoCEntityAmbient.func_70601_bi(MoCEntityAmbient.java:435)
at net.minecraft.world.WorldEntitySpawner.func_77192_a(WorldEntitySpawner.java:152)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:202)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at drzhark.mocreatures.MoCTools.biomeName(MoCTools.java:689)
at drzhark.mocreatures.entity.MoCEntityAmbient.func_70601_bi(MoCEntityAmbient.java:435)
at net.minecraft.world.WorldEntitySpawner.func_77192_a(WorldEntitySpawner.java:152)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:202)

-- Affected level --
Details:
Level name: Dad Mo Creatures
All players: 1 total; [EntityPlayerMP['clayton827'/1932, l='Dad Mo Creatures', x=1.50, y=72.00, z=251.50]]
Chunk stats: ServerChunkCache: 634 Drop: 0
Level seed: 7277935497141536949
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (4,64,252), Chunk: (at 4,4,12 in 0,15; contains blocks 0,0,240 to 15,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 34 game time, 34 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 120016 (now: false), thunder time: 141687 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
Minecraft Version: 1.12.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 213425440 bytes (203 MB) / 536330240 bytes (511 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
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP 9.41 Powered by Forge 14.22.1.2481 7 mods loaded, 7 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

| State | ID | Version | Source | Signature |
|:--------- |:----------------- |:------------ |:----------------------------------- |:---------------------------------------- |
| UCHIJAAAA | minecraft | 1.12.1 | minecraft.jar | None |
| UCHIJAAAA | mcp | 9.19 | minecraft.jar | None |
| UCHIJAAAA | FML | 8.0.99.99 | forge-1.12.1-14.22.1.2481.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | forge | 14.22.1.2481 | forge-1.12.1-14.22.1.2481.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAAAA | mercurius_updater | 1.0 | MercuriusUpdater-1.12.1.jar | None |
| UCHIJAAAA | mocreatures | 10.1.0 | DrZharks+MoCreatures+Mod-12_0_0_jar | None |
| UCHIJAAAA | lucky | 7.5.0 | LuckyBlock_1-12_v7-5-0_zip | None |

Loaded coremods (and transformers):
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['clayton827'/1932, l='Dad Mo Creatures', x=1.50, y=72.00, z=251.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Contact the developer.

Bloodshot (one of dev of moc and i think owner of CMS?) will fix this soon.

For what it's worth, I have same issue. Been some patches released but none have fixed this crash so far. Have no other mods loading just Forge/Mo' Creatures/Custom Mob Spawner. Delete everything and started over to no avail. I have No' Creatures

Quote from MadCowAK»

For what it's worth, I have same issue. Been some patches released but none have fixed this crash so far. Have no other mods loading just Forge/Mo' Creatures/Custom Mob Spawner. Delete everything and started over to no avail. I have No' Creatures