Unkown Crash

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 5/3/14 7:17 PM
Description: Unexpected error

java.lang.ClassCastException: awi cannot be cast to awd
	at aog.a(SourceFile:103)
	at aem.a(SourceFile:74)
	at agy.a(SourceFile:122)
	at buv.a(SourceFile:312)
	at bjf.ak(SourceFile:1256)
	at bjf.p(SourceFile:1602)
	at bjf.ai(SourceFile:801)
	at bjf.f(SourceFile:755)
	at net.minecraft.client.main.Main.main(SourceFile:121)


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

-- Head --
Stacktrace:
	at aog.a(SourceFile:103)
	at aem.a(SourceFile:74)
	at agy.a(SourceFile:122)
	at buv.a(SourceFile:312)
	at bjf.ak(SourceFile:1256)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bxb['tvand227'/3448, l='MpServer', x=393.56, y=53.20, z=28.80]]
	Chunk stats: MultiplayerChunkCache: 959, 959
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 389.00,4.00,90.00 - World: (389,4,90), Chunk: (at 5,0,10 in 24,5; contains blocks 384,0,80 to 399,255,95), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 261573 game time, 1282 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: 12 total; [uh['entity.ItemFrame.name'/4266208, l='MpServer', x=395.50, y=57.50, z=42.97], yn['Squid'/12692682, l='MpServer', x=399.53, y=55.05, z=43.53], uh['entity.ItemFrame.name'/4306418, l='MpServer', x=394.50, y=57.50, z=42.97], zg['item.item.redstone'/13528053, l='MpServer', x=389.69, y=49.00, z=21.72], uh['entity.ItemFrame.name'/4264978, l='MpServer', x=396.50, y=57.50, z=42.97], zg['item.item.redstone'/13528057, l='MpServer', x=387.72, y=49.00, z=23.84], zg['item.item.redstone'/13528072, l='MpServer', x=388.00, y=49.00, z=32.50], bxb['tvand227'/3448, l='MpServer', x=393.56, y=53.20, z=28.80], yn['Squid'/12451979, l='MpServer', x=399.53, y=54.11, z=42.36], uh['entity.ItemFrame.name'/4232306, l='MpServer', x=397.50, y=57.50, z=42.97], uh['entity.ItemFrame.name'/4189457, l='MpServer', x=398.50, y=57.50, z=42.97], zg['item.item.redstone'/13539210, l='MpServer', x=398.34, y=52.00, z=18.94]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at buw.a(SourceFile:308)
	at bjf.b(SourceFile:2069)
	at bjf.f(SourceFile:769)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w18b
	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: 401847600 bytes (383 MB) / 842006528 bytes (803 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: 14w18b
	LWJGL: 2.9.1
	OpenGL: GeForce GT 750M/PCIe/SSE2 GL version 4.3.0, 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.
Anisotropic filtering is supported and maximum anisotropy is 16.
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)
	Anisotropic Filtering: Off (1)