/setblock ~ ~ ~ minecraft:mob_spawner 0 replace {EntityId:ArmorStand}

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 7-10-14 15:05
Description: Ticking block entity

java.lang.ClassCastException: adi cannot be cast to xn
	at aqi.a(SourceFile:165)
	at aqi.c(SourceFile:108)
	at bdg.c(SourceFile:55)
	at aqu.i(SourceFile:1311)
	at qt.i(SourceFile:479)
	at net.minecraft.server.MinecraftServer.z(SourceFile:607)
	at net.minecraft.server.MinecraftServer.y(SourceFile:531)
	at cyk.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
	at aqi.a(SourceFile:165)
	at aqi.c(SourceFile:108)
	at bdg.c(SourceFile:55)

-- Block entity being ticked --
Details:
	Name: MobSpawner // bdg
	Block type: ID #52 (tile.mobSpawner // axr)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-500,20,446), Chunk: (at 12,1,14 in -32,27; contains blocks -512,0,432 to -497,255,447), 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 // axr)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at aqu.i(SourceFile:1311)
	at qt.i(SourceFile:479)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [qw['tryrodave'/260, l='New World', x=-499,27, y=18,82, z=444,56]]
	Chunk stats: ServerChunkCache: 1720 Drop: 0
	Level seed: 6737337316394647885
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: -20,00,4,00,269,00 - World: (-20,4,269), Chunk: (at 12,0,13 in -2,16; contains blocks -32,0,256 to -17,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 249704 game time, 10913 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 73409 (now: false), thunder time: 52910 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.z(SourceFile:607)
	at net.minecraft.server.MinecraftServer.y(SourceFile:531)
	at cyk.y(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:447)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.8
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 164729360 bytes (157 MB) / 305532928 bytes (291 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: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [qw['tryrodave'/260, l='New World', x=-499,27, y=18,82, z=444,56]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.