Hopper: java.lang.IllegalArgumentException: Cannot get property bcy{name=half, clazz=class ats, values=[upper, lower]} as it does not exist in bch{block=minec

java.lang.IllegalArgumentException: Cannot get property bcy{name=half, clazz=class ats, values=[upper, lower]} as it does not exist in bch{block=minecraft:air, properties=[]}
	at bck.b(SourceFile:112)
	at atr.a(SourceFile:147)
	at zi.d(SourceFile:29)
	at yr.a(SourceFile:87)
	at xb.bD(SourceFile:457)
	at xa.l(SourceFile:1431)
	at xb.l(SourceFile:327)
	at wd.l(SourceFile:126)
	at xa.j(SourceFile:1299)
	at xb.j(SourceFile:206)
	at apo.a(SourceFile:1414)
	at qi.a(SourceFile:569)
	at apo.g(SourceFile:1392)

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

Time: 7/16/14 9:24 PM
Description: Ticking entity

java.lang.IllegalArgumentException: Cannot get property bcy{name=half, clazz=class ats, values=[upper, lower]} as it does not exist in bch{block=minecraft:air, properties=[]}
	at bck.b(SourceFile:112)
	at atr.a(SourceFile:147)
	at zi.d(SourceFile:29)
	at yr.a(SourceFile:87)
	at xb.bD(SourceFile:457)
	at xa.l(SourceFile:1431)
	at xb.l(SourceFile:327)
	at wd.l(SourceFile:126)
	at xa.j(SourceFile:1299)
	at xb.j(SourceFile:206)
	at apo.a(SourceFile:1414)
	at qi.a(SourceFile:569)
	at apo.g(SourceFile:1392)
	at apo.i(SourceFile:1286)
	at qi.i(SourceFile:447)
	at net.minecraft.server.MinecraftServer.x(SourceFile:586)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at cvl.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 bck.b(SourceFile:112)
	at atr.a(SourceFile:147)
	at zi.d(SourceFile:29)
	at yr.a(SourceFile:87)
	at xb.bD(SourceFile:457)
	at xa.l(SourceFile:1431)
	at xb.l(SourceFile:327)
	at wd.l(SourceFile:126)
	at xa.j(SourceFile:1299)
	at xb.j(SourceFile:206)
	at apo.a(SourceFile:1414)
	at qi.a(SourceFile:569)
	at apo.g(SourceFile:1392)

-- Entity being ticked --
Details:
	Entity Type: Villager (afs)
	Entity ID: 19
	Entity Name: Villager
	Entity's Exact location: -1254.20, 5.00, -901.91
	Entity's Block location: -1255.00,5.00,-902.00 - World: (-1255,5,-902), Chunk: (at 9,0,10 in -79,-57; contains blocks -1264,0,-912 to -1249,255,-897), Region: (-3,-2; contains chunks -96,-64 to -65,-33, blocks -1536,0,-1024 to -1025,255,-513)
	Entity's Momentum: -0.08, -0.08, 0.03
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at apo.i(SourceFile:1286)
	at qi.i(SourceFile:447)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [ql['TequatlPatak'/26, l='New World', x=-1248.37, y=5.28, z=-906.65]]
	Chunk stats: ServerChunkCache: 388 Drop: 0
	Level seed: 8079267958871887690
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: -1192.00,4.00,-893.00 - World: (-1192,4,-893), Chunk: (at 8,0,3 in -75,-56; contains blocks -1200,0,-896 to -1185,255,-881), Region: (-3,-2; contains chunks -96,-64 to -65,-33, blocks -1536,0,-1024 to -1025,255,-513)
	Level time: 7860 game time, 7860 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 30405 (now: false), thunder time: 19605 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.x(SourceFile:586)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at cvl.w(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:426)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w29b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1098022376 bytes (1047 MB) / 1636827136 bytes (1561 MB) up to 3817865216 bytes (3641 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ql['TequatlPatak'/26, l='New World', x=-1248.37, y=5.28, z=-906.65]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.