Hopper: java.lang.IllegalArgumentException: Cannot get property bcj{name=half, clazz=class auu, values=[top, bottom]} as it does not exist!

java.lang.IllegalArgumentException: Cannot get property bcj{name=half, clazz=class auu, values=[top, bottom]} as it does not exist!
	at bbw.b(SourceFile:91)
	at aut.a(SourceFile:43)
	at bbn.a(SourceFile:141)
	at ary.a(SourceFile:526)
	at apm.a(SourceFile:782)
	at apm.a(SourceFile:658)
	at wy.s(SourceFile:1538)
	at aaq.a(SourceFile:32)
	at yd.a(SourceFile:20)
	at yd.apply(SourceFile:17)
	at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
	at bcw.a(SourceFile:766)
	at apm.a(SourceFile:2203)
	at yc.a(SourceFile:44)
	at yp.a(SourceFile:75)
	at wz.bC(SourceFile:460)
	at wy.l(SourceFile:1425)
	at wz.l(SourceFile:328)
	at aeo.l(SourceFile:39)
	at afk.l(SourceFile:201)
	at wy.j(SourceFile:1293)
	at wz.j(SourceFile:207)
	at aeo.j(SourceFile:44)
	at afk.j(SourceFile:257)
	at aeq.j(SourceFile:60)
	at apm.a(SourceFile:1370)
	at qg.a(SourceFile:572)
	at apm.g(SourceFile:1348)

---- Minecraft Crash Report ----
// Oops.

Time: 7/9/14 10:32 PM
Description: Ticking entity

java.lang.IllegalArgumentException: Cannot get property bcj{name=half, clazz=class auu, values=[top, bottom]} as it does not exist!
	at bbw.b(SourceFile:91)
	at aut.a(SourceFile:43)
	at bbn.a(SourceFile:141)
	at ary.a(SourceFile:526)
	at apm.a(SourceFile:782)
	at apm.a(SourceFile:658)
	at wy.s(SourceFile:1538)
	at aaq.a(SourceFile:32)
	at yd.a(SourceFile:20)
	at yd.apply(SourceFile:17)
	at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
	at bcw.a(SourceFile:766)
	at apm.a(SourceFile:2203)
	at yc.a(SourceFile:44)
	at yp.a(SourceFile:75)
	at wz.bC(SourceFile:460)
	at wy.l(SourceFile:1425)
	at wz.l(SourceFile:328)
	at aeo.l(SourceFile:39)
	at afk.l(SourceFile:201)
	at wy.j(SourceFile:1293)
	at wz.j(SourceFile:207)
	at aeo.j(SourceFile:44)
	at afk.j(SourceFile:257)
	at aeq.j(SourceFile:60)
	at apm.a(SourceFile:1370)
	at qg.a(SourceFile:572)
	at apm.g(SourceFile:1348)
	at apm.i(SourceFile:1253)
	at qg.i(SourceFile:450)
	at net.minecraft.server.MinecraftServer.x(SourceFile:586)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at cwg.w(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:426)
	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 bbw.b(SourceFile:91)
	at aut.a(SourceFile:43)
	at bbn.a(SourceFile:141)
	at ary.a(SourceFile:526)
	at apm.a(SourceFile:782)
	at apm.a(SourceFile:658)
	at wy.s(SourceFile:1538)
	at aaq.a(SourceFile:32)
	at yd.a(SourceFile:20)
	at yd.apply(SourceFile:17)
	at com.google.common.base.Predicates$AndPredicate.apply(Predicates.java:359)
	at bcw.a(SourceFile:766)
	at apm.a(SourceFile:2203)
	at yc.a(SourceFile:44)
	at yp.a(SourceFile:75)
	at wz.bC(SourceFile:460)
	at wy.l(SourceFile:1425)
	at wz.l(SourceFile:328)
	at aeo.l(SourceFile:39)
	at afk.l(SourceFile:201)
	at wy.j(SourceFile:1293)
	at wz.j(SourceFile:207)
	at aeo.j(SourceFile:44)
	at afk.j(SourceFile:257)
	at aeq.j(SourceFile:60)
	at apm.a(SourceFile:1370)
	at qg.a(SourceFile:572)
	at apm.g(SourceFile:1348)

-- Entity being ticked --
Details:
	Entity Type: PigZombie (aeq)
	Entity ID: 454
	Entity Name: Zombie Pigman
	Entity's Exact location: -315.60, 63.50, -241.98
	Entity's Block location: -316.00,63.00,-242.00 - World: (-316,63,-242), Chunk: (at 4,3,14 in -20,-16; contains blocks -320,0,-256 to -305,255,-241), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at apm.i(SourceFile:1253)
	at qg.i(SourceFile:450)

-- Affected level --
Details:
	Level name: New Genesis
	All players: 1 total; [qj['DrDoom_347'/366, l='New Genesis', x=-317.19, y=63.00, z=-271.70]]
	Chunk stats: ServerChunkCache: 1004 Drop: 0
	Level seed: -6745429076668951007
	Level generator: ID 04 - customized, ver 0. Features enabled: true
	Level generator options: {"coordinateScale":684.412,"heightScale":684.412,"lowerLimitScale":512.0,"upperLimitScale":512.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":5000.0,"mainNoiseScaleY":5000.0,"mainNoiseScaleZ":5000.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":0.4225352,"seaLevel":63,"useCaves":true,"useDungeons":true,"dungeonChance":30,"useStrongholds":true,"useVillages":true,"useMineShafts":true,"useTemples":true,"useRavines":true,"useWaterLakes":false,"waterLakeChance":4,"useLavaLakes":true,"lavaLakeChance":80,"useLavaOceans":false,"fixedBiome":-1,"biomeSize":4,"riverSize":3,"dirtSize":33,"dirtCount":6,"dirtMinHeight":0,"dirtMaxHeight":256,"gravelSize":33,"gravelCount":6,"gravelMinHeight":0,"gravelMaxHeight":256,"graniteSize":33,"graniteCount":7,"graniteMinHeight":0,"graniteMaxHeight":80,"dioriteSize":33,"dioriteCount":7,"dioriteMinHeight":0,"dioriteMaxHeight":80,"andesiteSize":33,"andesiteCount":7,"andesiteMinHeight":0,"andesiteMaxHeight":80,"coalSize":17,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":128,"ironSize":9,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":64,"goldSize":9,"goldCount":2,"goldMinHeight":0,"goldMaxHeight":32,"redstoneSize":8,"redstoneCount":8,"redstoneMinHeight":0,"redstoneMaxHeight":16,"diamondSize":8,"diamondCount":2,"diamondMinHeight":5,"diamondMaxHeight":16,"lapisSize":7,"lapisCount":1,"lapisCenterHeight":16,"lapisSpread":16}
	Level spawn location: -281.00,105.00,290.00 - World: (-281,105,290), Chunk: (at 7,6,2 in -18,18; contains blocks -288,0,288 to -273,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 17444883 game time, 1708730 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.x(SourceFile:586)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at cwg.w(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:426)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w28a
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 229714632 bytes (219 MB) / 487063552 bytes (464 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 92
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [qj['DrDoom_347'/366, l='New Genesis', x=-317.19, y=63.00, z=-271.70]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.