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

java.lang.IllegalArgumentException: Cannot get property bci{name=open, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist!
	at bbw.b(SourceFile:91)
	at bbs.a(SourceFile:13)
	at atk.a(SourceFile:140)
	at cdt.a(SourceFile:288)
	at bqi.ar(SourceFile:1325)

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 9/7/2014 6:51 μμ
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot get property bci{name=open, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist!
	at bbw.b(SourceFile:91)
	at bbs.a(SourceFile:13)
	at atk.a(SourceFile:140)
	at cdt.a(SourceFile:288)
	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 bbs.a(SourceFile:13)
	at atk.a(SourceFile:140)
	at cdt.a(SourceFile:288)
	at bqi.ar(SourceFile:1325)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [chv['vwd'/304, l='MpServer', x=242,77, y=71,00, z=190,05]]
	Chunk stats: MultiplayerChunkCache: 278, 278
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 256,00,64,00,252,00 - World: (256,64,252), Chunk: (at 0,4,12 in 16,15; contains blocks 256,0,240 to 271,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 17782 game time, 17782 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: 50 total; [abg['??????'/137, l='MpServer', x=227,06, y=73,00, z=181,31], abb['??????? ????'/136, l='MpServer', x=241,41, y=22,56, z=157,75], abg['????'/139, l='MpServer', x=227,03, y=68,91, z=187,00], abf['??????'/138, l='MpServer', x=236,69, y=77,00, z=186,47], abg['??????'/141, l='MpServer', x=234,81, y=69,00, z=186,38], abg['??????'/140, l='MpServer', x=239,41, y=71,00, z=191,78], abf['??????'/143, l='MpServer', x=224,50, y=95,00, z=248,50], abf['??????'/142, l='MpServer', x=229,75, y=90,00, z=255,66], abw['????'/131, l='MpServer', x=232,50, y=71,00, z=116,72], abw['????'/133, l='MpServer', x=235,50, y=78,00, z=112,50], abw['????'/132, l='MpServer', x=225,47, y=71,00, z=123,81], abg['??????'/134, l='MpServer', x=226,56, y=77,00, z=169,16], abg['??????'/154, l='MpServer', x=240,44, y=70,00, z=187,16], abg['??????'/155, l='MpServer', x=238,97, y=72,00, z=179,56], abb['??????? ????'/550146, l='MpServer', x=192,75, y=50,03, z=151,25], abb['??????? ????'/551986, l='MpServer', x=251,97, y=30,13, z=140,50], abb['??????? ????'/333493, l='MpServer', x=204,50, y=60,40, z=267,36], abf['??????'/187, l='MpServer', x=287,53, y=77,00, z=269,75], abf['??????'/185, l='MpServer', x=283,88, y=81,00, z=123,13], abf['??????'/190, l='MpServer', x=294,44, y=78,00, z=140,97], abf['??????'/191, l='MpServer', x=292,44, y=79,00, z=139,50], abf['??????'/188, l='MpServer', x=284,91, y=74,00, z=269,75], abf['??????'/189, l='MpServer', x=280,69, y=82,00, z=263,44], abb['??????? ????'/551981, l='MpServer', x=264,78, y=27,94, z=135,91], abf['??????'/178, l='MpServer', x=261,94, y=83,00, z=240,81], abb['??????? ????'/333482, l='MpServer', x=190,02, y=53,16, z=259,17], abf['??????'/176, l='MpServer', x=257,50, y=74,00, z=156,25], abf['??????'/177, l='MpServer', x=270,63, y=86,00, z=213,34], abb['??????? ????'/552251, l='MpServer', x=199,88, y=47,44, z=148,75], abb['??????? ????'/333485, l='MpServer', x=190,35, y=53,97, z=264,44], abw['????'/201, l='MpServer', x=316,44, y=74,00, z=202,50], abw['????'/200, l='MpServer', x=314,47, y=76,00, z=197,19], abb['??????? ????'/199, l='MpServer', x=294,53, y=58,38, z=202,53], abn['??????'/198, l='MpServer', x=312,50, y=75,00, z=178,66], abn['??????'/193, l='MpServer', x=302,47, y=87,00, z=189,69], abf['??????'/192, l='MpServer', x=293,53, y=79,00, z=139,44], abw['????'/87, l='MpServer', x=170,50, y=78,00, z=148,50], abw['????'/86, l='MpServer', x=172,34, y=70,00, z=137,19], abf['??????'/89, l='MpServer', x=172,81, y=75,00, z=193,53], abf['??????'/208, l='MpServer', x=322,44, y=67,00, z=185,78], abf['??????'/88, l='MpServer', x=171,44, y=76,00, z=193,63], abf['??????'/209, l='MpServer', x=321,00, y=66,00, z=190,06], abf['??????'/91, l='MpServer', x=169,75, y=77,00, z=200,28], abf['??????'/90, l='MpServer', x=172,66, y=75,00, z=192,13], abw['????'/96, l='MpServer', x=175,19, y=70,00, z=141,47], chv['vwd'/304, l='MpServer', x=242,77, y=71,00, z=190,05], abf['??????'/117, l='MpServer', x=217,78, y=99,00, z=244,25], abf['??????'/116, l='MpServer', x=222,50, y=95,00, z=248,50], abg['??????'/115, l='MpServer', x=217,38, y=76,00, z=166,28], abw['????'/113, l='MpServer', x=222,69, y=69,00, z=117,13]]
	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 (x86) version 6.3
	Java Version: 1.7.0_60, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 59156296 bytes (56 MB) / 288202752 bytes (274 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 14w28a
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3282, Intel
	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: ??????? (??????)
	Profiler Position: N/A (disabled)