---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 5/26/17 11:47 PM
Description: Ticking block entity

java.lang.IllegalArgumentException
	at rq.a(SourceFile:18)
	at rq.a(SourceFile:37)
	at amh.i(SourceFile:141)
	at amh.c(SourceFile:128)
	at avv.e(SourceFile:91)
	at amr.k(SourceFile:1417)
	at om.k(SourceFile:547)
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cgx.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	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 amh.i(SourceFile:141)
	at amh.c(SourceFile:128)
	at avv.e(SourceFile:91)

-- Block entity being ticked --
Details:
	Name: minecraft:mob_spawner // avv
	Block type: ID #52 (tile.mobSpawner // arw)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-11,66,274), Chunk: (at 5,4,2 in -1,17; contains blocks -16,0,272 to -1,255,287), 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 // arw)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at amr.k(SourceFile:1417)
	at om.k(SourceFile:547)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [oo[''/758, l='New World', x=-10.28, y=67.00, z=272.47]]
	Chunk stats: ServerChunkCache: 654 Drop: 0
	Level seed: 4220600848133081182
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-15,64,275), Chunk: (at 1,4,3 in -1,17; contains blocks -16,0,272 to -1,255,287), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 94 game time, 94 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 149455 (now: false), thunder time: 98476 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cgx.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.12-pre5
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 117875032 bytes (112 MB) / 380514304 bytes (362 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: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [oo[''/758, l='New World', x=-10.28, y=67.00, z=272.47]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.