---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 6/4/17 8:16 PM
Description: Ticking block entity

java.lang.IllegalArgumentException
	at rq.a(SourceFile:18)
	at rq.a(SourceFile:37)
	at ami.i(SourceFile:141)
	at ami.c(SourceFile:76)
	at avw.e(SourceFile:91)
	at ams.k(SourceFile:1417)
	at om.k(SourceFile:547)
	at net.minecraft.server.MinecraftServer.D(SourceFile:632)
	at net.minecraft.server.MinecraftServer.C(SourceFile:560)
	at chb.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:464)
	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 rq.a(SourceFile:18)
	at rq.a(SourceFile:37)
	at ami.i(SourceFile:141)
	at ami.c(SourceFile:76)
	at avw.e(SourceFile:91)

-- Block entity being ticked --
Details:
	Name: minecraft:mob_spawner // avw
	Block type: ID #52 (tile.mobSpawner // arx)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-194,76,238), Chunk: (at 14,4,14 in -13,14; contains blocks -208,0,224 to -193,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Actual block type: ID #52 (tile.mobSpawner // arx)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at ams.k(SourceFile:1417)
	at om.k(SourceFile:547)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [oo['miwob'/397, l='New World', x=-193.70, y=75.00, z=238.10]]
	Chunk stats: ServerChunkCache: 3520 Drop: 0
	Level seed: 7471304572643166025
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-200,64,232), Chunk: (at 8,4,8 in -13,14; contains blocks -208,0,224 to -193,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 12785 game time, 12785 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 122617 (now: false), thunder time: 130112 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:632)
	at net.minecraft.server.MinecraftServer.C(SourceFile:560)
	at chb.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:464)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.12-pre7
	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: 298159680 bytes (284 MB) / 1129316352 bytes (1077 MB) up to 4107796480 bytes (3917 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmn512M
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [oo['miwob'/397, l='New World', x=-193.70, y=75.00, z=238.10]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.