Hopper: java.lang.ClassCastException: ce cannot be cast to ci

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-78327/

Crash:

java.lang.ClassCastException: ce cannot be cast to ci
	at bx.d(SourceFile:120)
	at yd.a(SourceFile:439)
	at awv.a(SourceFile:188)
	at awv.a(SourceFile:168)
	at bfb.b(SourceFile:718)
	at ats.S(SourceFile:686)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)

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

---- Minecraft Crash Report ----
// Sorry :(

Time: 9/13/13 8:07 PM
Description: Reading NBT data

java.lang.ClassCastException: ce cannot be cast to ci
	at bx.d(SourceFile:120)
	at yd.a(SourceFile:439)
	at awv.a(SourceFile:188)
	at awv.a(SourceFile:168)
	at bfb.b(SourceFile:718)
	at ats.S(SourceFile:686)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Corrupt NBT tag --
Details:
	Tag type found: INT
	Tag type expected: SHORT
	Tag name: id
Stacktrace:
	at bx.d(SourceFile:120)
	at yd.a(SourceFile:439)
	at awv.a(SourceFile:188)
	at awv.a(SourceFile:168)

-- Screen render details --
Details:
	Screen name: axg
	Mouse location: Scaled: (275, 193). Absolute: (551, 92)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['Corliansa'/35, l='MpServer', x=-554.96, y=5.62, z=274.06]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-548,4,293), Chunk: (at 12,0,5 in -35,18; contains blocks -560,0,288 to -545,255,303), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
	Level time: 119203 game time, 119203 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: 7 total; [sc['Iron Golem'/1, l='MpServer', x=-572.19, y=4.00, z=300.00], sc['Iron Golem'/2, l='MpServer', x=-578.75, y=4.00, z=285.66], sc['Iron Golem'/4, l='MpServer', x=-559.56, y=4.00, z=240.19], un['Small Fireball'/5, l='MpServer', x=-538.50, y=6.50, z=300.50], un['Small Fireball'/6, l='MpServer', x=-538.50, y=6.50, z=300.50], bdf['Corliansa'/35, l='MpServer', x=-554.96, y=5.62, z=274.06], uu['entity.WitherSkull.name'/7, l='MpServer', x=-493.53, y=5.00, z=293.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bda.a(SourceFile:284)
	at ats.b(SourceFile:1761)
	at ats.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 265168096 bytes (252 MB) / 452329472 bytes (431 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 11635 (651560 bytes; 0 MB) allocated, 5 (280 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.18.10.3222, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 79 (4424 bytes; 0 MB) allocated, 35 (1960 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-78327/10432245/