Hopper: java.lang.IllegalArgumentException: Cannot get property bci{name=north, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist!

java.lang.IllegalArgumentException: Cannot get property bci{name=north, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist!
	at bbw.b(SourceFile:91)
	at azn.c(SourceFile:221)
	at azn.a(SourceFile:51)
	at brw.c(SourceFile:152)
	at brw.b(SourceFile:69)
	at brw.a(SourceFile:46)
	at brm.a(SourceFile:205)

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 7/9/14 12:02 PM
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot get property bci{name=north, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist!
	at bbw.b(SourceFile:91)
	at azn.c(SourceFile:221)
	at azn.a(SourceFile:51)
	at brw.c(SourceFile:152)
	at brw.b(SourceFile:69)
	at brw.a(SourceFile:46)
	at brm.a(SourceFile:205)
	at cir.b(SourceFile:994)
	at bqi.ap(SourceFile:888)
	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 azn.c(SourceFile:221)
	at azn.a(SourceFile:51)
	at brw.c(SourceFile:152)
	at brw.b(SourceFile:69)
	at brw.a(SourceFile:46)
	at brm.a(SourceFile:205)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [chv['stephen134'/0, l='MpServer', x=-26.54, y=30.81, z=0.71]]
	Chunk stats: MultiplayerChunkCache: 289, 289
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 0.00,33.00,0.00 - World: (0,33,0), Chunk: (at 0,2,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 324642 game time, 8126 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: 1 total; [chv['stephen134'/0, l='MpServer', x=-26.54, y=30.81, z=0.71]]
	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 8.1 (amd64) version 6.3
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 185773544 bytes (177 MB) / 525860864 bytes (501 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: 0, tallocated: 0
	Launched Version: 14w28a
	LWJGL: 2.9.1
	OpenGL: AMD Radeon HD 7540D GL version 4.2.12422 Compatibility Profile Context 13.152.1.1000, ATI Technologies Inc.
	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 (US)
	Profiler Position: N/A (disabled)