Hopper: java.lang.ClassCastException: cl cannot be cast to cf

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-84388/

Crash:

java.lang.ClassCastException: cl cannot be cast to cf
	at bz.l(SourceFile:200)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Oops.

Time: 9/6/13 3:09 PM
Description: Reading NBT data

java.lang.ClassCastException: ch cannot be cast to cf
	at bz.l(SourceFile:200)
	at yk.a(SourceFile:85)
	at yl.a(SourceFile:72)
	at yx.a(SourceFile:433)
	at bak.a(SourceFile:548)
	at azw.a(SourceFile:168)
	at ban.a(SourceFile:30)
	at bak.a(SourceFile:530)
	at bho.b(SourceFile:720)
	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.l(SourceFile:200)

-- Corrupt NBT tag --
Details:
	Tag type found: LIST
	Tag type expected: INT[]
	Tag name: Colors
Stacktrace:
	at bz.l(SourceFile:200)
	at yk.a(SourceFile:85)
	at yl.a(SourceFile:72)
	at yx.a(SourceFile:433)
	at bak.a(SourceFile:548)
	at azw.a(SourceFile:168)
	at ban.a(SourceFile:30)
	at bak.a(SourceFile:530)

-- Screen render details --
Details:
	Screen name: bak
	Mouse location: Scaled: (235, 172). Absolute: (941, 330)
	Screen size: Scaled: (480, 255). Absolute: (1920, 1017). Scale factor of 4

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['iabrams'/306934, l='MpServer', x=-1178.32, y=60.74, z=-388.06]]
	Chunk stats: MultiplayerChunkCache: 322, 322
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-1183,4,-416), Chunk: (at 1,0,0 in -74,-26; contains blocks -1184,0,-416 to -1169,255,-401), Region: (-3,-1; contains chunks -96,-32 to -65,-1, blocks -1536,0,-512 to -1025,255,-1)
	Level time: 1294536 game time, 7411 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: 46 total; [su['Wolf'/1548065, l='MpServer', x=-1178.41, y=54.00, z=-388.72], un['Zombie'/1596914, l='MpServer', x=-1158.66, y=53.00, z=-340.50], un['Zombie'/1596913, l='MpServer', x=-1162.28, y=53.00, z=-343.88], ui['Skeleton'/1587569, l='MpServer', x=-1161.22, y=53.00, z=-344.09], tw['Creeper'/1620073, l='MpServer', x=-1152.50, y=53.00, z=-345.50], os['entity.ItemFrame.name'/306925, l='MpServer', x=-1151.94, y=59.50, z=-387.50], os['entity.ItemFrame.name'/306924, l='MpServer', x=-1151.94, y=59.50, z=-389.50], ui['Skeleton'/1614165, l='MpServer', x=-1162.16, y=53.00, z=-333.59], sn['Pig'/306926, l='MpServer', x=-1127.09, y=53.00, z=-399.28], tw['Creeper'/1596908, l='MpServer', x=-1159.22, y=53.00, z=-347.22], os['entity.ItemFrame.name'/306923, l='MpServer', x=-1151.94, y=59.50, z=-388.50], un['Zombie'/1572461, l='MpServer', x=-1153.50, y=53.00, z=-344.50], tw['Creeper'/1572460, l='MpServer', x=-1157.31, y=53.00, z=-346.50], tw['Creeper'/1586433, l='MpServer', x=-1160.16, y=53.00, z=-343.34], ui['Skeleton'/1563465, l='MpServer', x=-1160.53, y=53.00, z=-338.44], un['Zombie'/1586439, l='MpServer', x=-1158.34, y=53.00, z=-344.53], tw['Creeper'/1591003, l='MpServer', x=-1154.44, y=53.00, z=-344.56], un['Zombie'/1612726, l='MpServer', x=-1156.50, y=53.00, z=-340.50], un['Zombie'/1586442, l='MpServer', x=-1158.03, y=53.00, z=-343.41], un['Zombie'/1612725, l='MpServer', x=-1147.63, y=53.00, z=-346.13], un['Zombie'/1607844, l='MpServer', x=-1162.72, y=53.00, z=-338.97], ui['Skeleton'/1592674, l='MpServer', x=-1155.50, y=53.00, z=-339.50], sh['Horse'/306895, l='MpServer', x=-1199.81, y=53.00, z=-409.00], sh['Donkey'/306894, l='MpServer', x=-1172.34, y=53.00, z=-449.66], sn['Pig'/306893, l='MpServer', x=-1163.97, y=53.00, z=-448.09], sh['Horse'/306892, l='MpServer', x=-1202.88, y=53.00, z=-360.97], sh['Donkey'/306891, l='MpServer', x=-1208.00, y=53.00, z=-393.09], os['entity.ItemFrame.name'/306890, l='MpServer', x=-1190.94, y=55.50, z=-392.50], ui['Skeleton'/1594167, l='MpServer', x=-1162.63, y=53.00, z=-344.91], ui['Skeleton'/1620605, l='MpServer', x=-1153.50, y=53.00, z=-339.50], un['Zombie'/1578518, l='MpServer', x=-1156.03, y=53.00, z=-342.66], op['Experience Orb'/1544201, l='MpServer', x=-1170.03, y=53.25, z=-401.69], op['Experience Orb'/1544202, l='MpServer', x=-1167.19, y=53.25, z=-403.28], tw['Creeper'/1616154, l='MpServer', x=-1152.50, y=53.00, z=-337.50], uk['Spider'/1561124, l='MpServer', x=-1149.59, y=53.00, z=-333.75], un['Zombie'/1593937, l='MpServer', x=-1155.38, y=53.00, z=-341.88], tw['Creeper'/1604971, l='MpServer', x=-1157.72, y=53.00, z=-340.84], tw['Creeper'/1493816, l='MpServer', x=-1160.97, y=53.00, z=-340.28], bfn['iabrams'/306934, l='MpServer', x=-1178.32, y=60.74, z=-388.06], tj['item.item.porkchopRaw'/1575009, l='MpServer', x=-1190.22, y=54.13, z=-409.16], tw['Creeper'/1601015, l='MpServer', x=-1161.34, y=53.00, z=-342.88], un['Zombie'/923482, l='MpServer', x=-1185.53, y=45.00, z=-383.59], un['Zombie'/1608037, l='MpServer', x=-1156.88, y=53.00, z=-341.78], un['Zombie'/1608045, l='MpServer', x=-1154.50, y=53.00, z=-342.50], tw['Creeper'/1608041, l='MpServer', x=-1154.50, y=53.00, z=-337.50], ui['Skeleton'/1507354, l='MpServer', x=-1160.16, y=53.00, z=-337.50]]
	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 8 (amd64) version 6.2
	Java Version: 1.7.0_13, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 112515584 bytes (107 MB) / 419037184 bytes (399 MB) up to 3817799680 bytes (3640 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
	AABB Pool Size: 1510 (84560 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 2500 GL version 4.0.0 - Build 9.17.10.2792, Intel
	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: 237 (13272 bytes; 0 MB) allocated, 30 (1680 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-84388/8378616/