Crashed when placing a ladder on a block.
==============
CRASH REPORT
==============
---- Minecraft Crash Report ----
// Why is it breaking

Time: 14年7月10日 下午6:52
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot get property bck

{name=facing, clazz=class ei, values=[north, south, west, east]}

as it does not exist!
at bbw.b(SourceFile:91)
at avi.a(SourceFile:47)
at avi.a(SourceFile:35)
at apm.a(SourceFile:2320)
at ait.a(SourceFile:106)
at cdt.a(SourceFile:295)
at bqi.ar(SourceFile:1325)
at bqi.q(SourceFile:1682)
at bqi.ap(SourceFile:863)
at bqi.a(SourceFile:303)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at bbw.b(SourceFile:91)
at avi.a(SourceFile:47)
at avi.a(SourceFile:35)
at apm.a(SourceFile:2320)
at ait.a(SourceFile:106)
at cdt.a(SourceFile:295)
at bqi.ar(SourceFile:1325)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [chv['tutuw002'/26, l='MpServer', x=395.11, y=138.28, z=25.55]]
Chunk stats: MultiplayerChunkCache: 1089, 1089
Level seed: 0
Level generator: ID 04 - customized, ver 0. Features enabled: false
Level generator options:
Level spawn location: 379.00,251.00,56.00 - World: (379,251,56), Chunk: (at 11,15,8 in 23,3; contains blocks 368,0,48 to 383,255,63), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 342615 game time, 29252 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 47 total; [adr['Creeper'/93182, l='MpServer', x=390.50, y=15.02, z=53.50], ww['entity.ItemFrame.name'/2, l='MpServer', x=377.03, y=251.50, z=55.50], afk['Zombie'/84243, l='MpServer', x=392.50, y=23.02, z=69.50], afq['Villager'/5, l='MpServer', x=394.28, y=175.00, z=32.69], abb['Bat'/96968, l='MpServer', x=403.50, y=15.10, z=55.50], adt['Enderman'/91113, l='MpServer', x=406.50, y=28.02, z=63.50], adr['Creeper'/86673, l='MpServer', x=413.50, y=19.02, z=39.50], afq['Villager'/10, l='MpServer', x=422.50, y=171.00, z=17.50], adr['Creeper'/74473, l='MpServer', x=416.50, y=18.00, z=33.50], chv['tutuw002'/26, l='MpServer', x=395.11, y=138.28, z=25.55], abb['Bat'/88367, l='MpServer', x=391.81, y=25.05, z=65.80], aex['Skeleton'/98052, l='MpServer', x=406.50, y=28.00, z=60.50], adr['Creeper'/74470, l='MpServer', x=416.50, y=18.00, z=31.50], abb['Bat'/67032, l='MpServer', x=415.88, y=13.19, z=41.56], afk['Zombie'/63576, l='MpServer', x=385.50, y=15.00, z=56.50], adr['Creeper'/84141, l='MpServer', x=369.81, y=14.00, z=20.47], aex['Skeleton'/86168, l='MpServer', x=366.50, y=14.02, z=22.50], aex['Skeleton'/68370, l='MpServer', x=390.50, y=25.00, z=66.50], adr['Creeper'/84136, l='MpServer', x=367.50, y=14.02, z=22.50], adr['Creeper'/84134, l='MpServer', x=364.50, y=14.02, z=21.50], abb['Bat'/59160, l='MpServer', x=401.47, y=28.06, z=64.81], aex['Skeleton'/86166, l='MpServer', x=368.38, y=14.00, z=20.38], aex['Skeleton'/86167, l='MpServer', x=368.50, y=14.02, z=22.50], adr['Creeper'/84133, l='MpServer', x=366.50, y=14.02, z=21.50], abb['Bat'/95640, l='MpServer', x=414.34, y=19.07, z=29.04], abb['Bat'/95642, l='MpServer', x=414.50, y=19.16, z=28.93], abb['Bat'/98085, l='MpServer', x=413.50, y=18.10, z=40.50], abb['Bat'/62082, l='MpServer', x=418.38, y=16.58, z=4.24], aex['Skeleton'/94197, l='MpServer', x=375.50, y=13.02, z=16.50], afk['Zombie'/98394, l='MpServer', x=387.50, y=24.00, z=75.50], aex['Skeleton'/69997, l='MpServer', x=414.50, y=16.00, z=-4.50], adr['Creeper'/66010, l='MpServer', x=410.50, y=15.00, z=44.50], abb['Bat'/73128, l='MpServer', x=411.09, y=19.31, z=45.63], aff['Spider'/87191, l='MpServer', x=409.51, y=14.00, z=49.13], abz['Squid'/85036, l='MpServer', x=396.50, y=37.00, z=20.50], abz['Squid'/85035, l='MpServer', x=395.50, y=37.00, z=24.38], afk['Zombie'/77781, l='MpServer', x=409.94, y=24.00, z=67.75], abz['Squid'/85034, l='MpServer', x=395.50, y=37.00, z=25.53], abz['Squid'/85033, l='MpServer', x=397.50, y=34.00, z=30.50], adr['Creeper'/74271, l='MpServer', x=414.50, y=18.00, z=35.50], afk['Zombie'/61022, l='MpServer', x=415.50, y=15.00, z=-2.50], abb['Bat'/57252, l='MpServer', x=418.03, y=23.56, z=41.75], afk['Zombie'/61019, l='MpServer', x=417.50, y=15.00, z=-0.50], afk['Zombie'/74267, l='MpServer', x=412.50, y=18.00, z=42.50], afk['Zombie'/87195, l='MpServer', x=410.88, y=14.00, z=47.09], aez['Slime'/53856, l='MpServer', x=427.93, y=28.28, z=63.55], adr['Creeper'/56607, l='MpServer', x=413.50, y=19.00, z=49.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at cdu.a(SourceFile:308)
at bqi.b(SourceFile:2139)
at bqi.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 14w28a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 332999104 bytes (317 MB) / 737476608 bytes (703 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 12, allocated: 24, tallocated: 74
Launched Version: 14w28a
LWJGL: 2.9.1
OpenGL: GeForce 9500 GT/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (UK)
Profiler Position: N/A (disabled)