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So I decided to play on Mo' Creatures again but with the most updated version. I have installed many mods in the past and have never had this problem. After I installed it i created a world and it was stuck on the loading screen and after I closed minecraft it said it crashed. I installed the 1.10 version and didn't have a problem its just the recent one. Can anyone help me please!? Any suggestions would be very appreciated.

This was the crash report:

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 12/11/17 1:13 PM
Description: Exception in server tick loop

java.lang.IllegalAccessError: tried to access field net.minecraft.util.registry.RegistryNamespaced.field_148758_b from class drzhark.customspawner.environment.EnvironmentSettings
at drzhark.customspawner.environment.EnvironmentSettings.initializeBiomes(EnvironmentSettings.java:515)
at drzhark.customspawner.utils.CMSUtils.addWorldEnvironment(CMSUtils.java:142)
at drzhark.customspawner.EventHooks.structureMapGen(EventHooks.java:188)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_17_EventHooks_structureMapGen_InitMapGenEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:179)
at net.minecraftforge.event.terraingen.TerrainGen.getModdedMapGen(TerrainGen.java:47)
at net.minecraft.world.gen.ChunkGeneratorOverworld.<init>(ChunkGeneratorOverworld.java:69)
at net.minecraft.world.WorldType.getChunkGenerator(WorldType.java:140)
at net.minecraft.world.WorldProvider.func_186060_c(WorldProvider.java:63)
at net.minecraft.world.WorldServer.func_72970_h(WorldServer.java:847)
at net.minecraft.world.WorldServer.<init>(WorldServer.java:118)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:121)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 322358584 bytes (307 MB) / 687865856 bytes (656 MB) up to 1073741824 bytes (1024 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP 9.42 Powered by Forge 14.23.1.2555 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 |
|:------- |:----------------- |:------------ |:--------------------------------------- |:---------------------------------------- |
| UCHIJAA | minecraft | 1.12.2 | minecraft.jar | None |
| UCHIJAA | mcp | 9.42 | minecraft.jar | None |
| UCHIJAA | FML | 8.0.99.99 | forge-1.12.2-14.23.1.2555.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAA | forge | 14.23.1.2555 | forge-1.12.2-14.23.1.2555.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| UCHIJAA | mercurius_updater | 1.0 | MercuriusUpdater-1.12.2.jar | None |
| UCHIJAA | customspawner | 3.11.3 | CustomMobSpawner-3.11.3.jar.zip | None |
| UCHIJAA | mocreatures | 12.0.3 | DrZharks MoCreatures Mod-12.0.3.jar.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: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

I downloaded it from the website of Mo Creatures. It says jar on it but it has an image of a folder. Could you provided me with the jar file download? Thanks!

I got the jar's and installed the mod loaded up a world and everything works perfectly! Thank you! This Issue has now been RESOLVED.