Hopper: java.lang.ClassCastException: ch cannot be cast to bz

java.lang.ClassCastException: ch cannot be cast to bz
	at bz.m(SourceFile:209)

---- Minecraft Crash Report ----
// Don't do that.

Time: 07/09/13 19:56
Description: Reading NBT data

java.lang.ClassCastException: cl cannot be cast to bz
	at bz.m(SourceFile:209)
	at wx.b(SourceFile:168)
	at wx.a(SourceFile:135)
	at bjh.a(SourceFile:108)
	at bjh.a(SourceFile:29)
	at biw.a(SourceFile:206)
	at biw.a(SourceFile:186)
	at bhv.a(SourceFile:327)
	at bho.a(SourceFile:848)
	at bho.b(SourceFile:697)
	at awb.V(SourceFile:713)
	at awb.e(SourceFile:642)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at bz.m(SourceFile:209)

-- Corrupt NBT tag --
Details:
	Tag type found: STRING
	Tag type expected: COMPOUND
	Tag name: display
Stacktrace:
	at bz.m(SourceFile:209)
	at wx.b(SourceFile:168)
	at wx.a(SourceFile:135)
	at bjh.a(SourceFile:108)
	at bjh.a(SourceFile:29)

-- Entity being rendered --
Details:
	Entity Type: Item (tj)
	Entity ID: 2998179
	Entity Name: item.item.helmetCloth
	Entity's Exact location: -773.56, 67.31, 834.97
	Entity's Block location: World: (-774,67,834), Chunk: (at 10,4,2 in -49,52; contains blocks -784,0,832 to -769,255,847), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Entity's Momentum: 0.27, 0.09, -0.15

-- Renderer details --
Details:
	Assigned renderer: bjh@61c45280
	Location: -0.02,-0.31,-0.00 - World: (-1,-1,-1), Chunk: (at 15,-1,15 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Rotation: 46.83746
	Delta: 0.28712618
Stacktrace:
	at biw.a(SourceFile:206)
	at biw.a(SourceFile:186)
	at bhv.a(SourceFile:327)
	at bho.a(SourceFile:848)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['ShinyRelic'/278, l='MpServer', x=-773.54, y=67.62, z=834.97]]
	Chunk stats: MultiplayerChunkCache: 317, 317
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-112,64,256), Chunk: (at 0,4,0 in -7,16; contains blocks -112,0,256 to -97,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 121003 game time, 121003 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: 26 total; [sd['Bat'/2987567, l='MpServer', x=-760.47, y=36.10, z=844.59], sd['Bat'/159039, l='MpServer', x=-768.25, y=52.10, z=825.25], sd['Bat'/126257, l='MpServer', x=-768.53, y=55.10, z=824.75], sr['Squid'/250021, l='MpServer', x=-798.50, y=46.34, z=841.06], sd['Bat'/2997132, l='MpServer', x=-805.66, y=33.00, z=825.94], sd['Bat'/2997133, l='MpServer', x=-772.13, y=49.23, z=790.41], sd['Bat'/2997130, l='MpServer', x=-808.44, y=32.73, z=824.63], sd['Bat'/2997131, l='MpServer', x=-807.41, y=33.10, z=827.09], sd['Bat'/2997129, l='MpServer', x=-808.38, y=32.00, z=826.50], sd['Bat'/2997125, l='MpServer', x=-743.25, y=30.82, z=844.53], sd['Bat'/2997120, l='MpServer', x=-748.69, y=15.26, z=846.75], sd['Bat'/2997121, l='MpServer', x=-745.25, y=13.13, z=846.59], sd['Bat'/1724177, l='MpServer', x=-767.66, y=56.10, z=836.75], sd['Bat'/2492135, l='MpServer', x=-766.25, y=55.10, z=827.25], sr['Squid'/49228, l='MpServer', x=-800.38, y=46.38, z=840.50], sr['Squid'/182870, l='MpServer', x=-801.44, y=46.19, z=840.50], sd['Bat'/2776227, l='MpServer', x=-797.53, y=51.10, z=820.13], sd['Bat'/1676576, l='MpServer', x=-797.50, y=51.10, z=821.34], sr['Squid'/49234, l='MpServer', x=-799.50, y=46.00, z=843.44], sd['Bat'/1724175, l='MpServer', x=-763.75, y=55.10, z=826.75], sr['Squid'/1507744, l='MpServer', x=-798.50, y=46.09, z=842.25], bfn['ShinyRelic'/278, l='MpServer', x=-773.54, y=67.62, z=834.97], sd['Bat'/2359989, l='MpServer', x=-768.50, y=55.10, z=824.75], sd['Bat'/2990817, l='MpServer', x=-828.50, y=33.95, z=855.75], sd['Bat'/2990816, l='MpServer', x=-777.75, y=46.10, z=879.72], sr['Squid'/49269, l='MpServer', x=-800.50, y=46.28, z=841.69]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfi.a(SourceFile:285)
	at awb.b(SourceFile:1813)
	at awb.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_22, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 72661080 bytes (69 MB) / 270467072 bytes (257 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 351 (19656 bytes; 0 MB) allocated, 332 (18592 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 6450 GL version 4.2.12002 Compatibility Profile Context 9.12.0.0, ATI Technologies Inc.
	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)
	Vec3 Pool Size: 373 (20888 bytes; 0 MB) allocated, 350 (19600 bytes; 0 MB) used