---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 5/25/18 5:44 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException
	at net.minecraft.util.WeightedRandom.func_76273_a(SourceFile:18)
	at net.minecraft.util.WeightedRandom.func_76271_a(SourceFile:37)
	at net.minecraft.world.WorldEntitySpawner.func_77191_a(WorldEntitySpawner.java:259)
	at net.minecraft.world.gen.ChunkGeneratorOverworld.func_185931_b(ChunkGeneratorOverworld.java:466)
	at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1017)
	at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:997)
	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:157)
	at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:344)
	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:142)
	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:156)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)
	at java.lang.Thread.run(Unknown Source)


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_161, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 472295752 bytes (450 MB) / 1636827136 bytes (1561 MB) up to 3817865216 bytes (3641 MB)
	JVM Flags: 4 total; -Xmx4096m -Xms256m -XX:PermSize=256m -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump
	IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
	FML: MCP 9.42 Powered by Forge 14.23.3.2702 10 mods loaded, 10 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-1.12.2-14.23.3.2702.jar                   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
	| UCHIJAA | forge             | 14.23.3.2702 | forge-1.12.2-14.23.3.2702.jar                   | e3c3d50c7c986df74c645c0ac54639741c90a557 |
	| UCHIJAA | redstoneflux      | 2.0.1        | RedstoneFlux-1.12-2.0.1.2-universal.jar         | d4f1503fbacd9b9fb767720420c5395104239ec9 |
	| UCHIJAA | cofhcore          | 4.4.1        | CoFHCore-1.12.2-4.4.1.12-universal.jar          | None                                     |
	| UCHIJAA | cofhworld         | 1.1.1        | CoFHWorld-1.12.2-1.1.1.12-universal.jar         | None                                     |
	| UCHIJAA | jei               | 4.9.1.191    | jei_1.12.2-4.9.1.191.jar                        | None                                     |
	| UCHIJAA | thermalfoundation | 2.4.1        | ThermalFoundation-1.12.2-2.4.1.15-universal.jar | 8a6abf2cb9e141b866580d369ba6548732eff25f |
	| UCHIJAA | usefulcows        | 1.0.4        | usefullcows-1.0.4.jar                           | 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'