Hopper: java.lang.ClassCastException: by cannot be cast to cg

java.lang.ClassCastException: by cannot be cast to cg
	at by.m(SourceFile:201)
	at ye.a(SourceFile:461)
	at awy.a(SourceFile:188)
	at axm.a(SourceFile:580)
	at awy.a(SourceFile:168)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)
	at bfe.b(SourceFile:718)
	at atv.S(SourceFile:686)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 9/22/13 1:53 PM
Description: Reading NBT data

java.lang.ClassCastException: ck cannot be cast to cg
	at by.m(SourceFile:201)
	at ye.a(SourceFile:461)
	at awy.a(SourceFile:188)
	at axm.a(SourceFile:580)
	at awy.a(SourceFile:168)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)
	at bfe.b(SourceFile:718)
	at atv.S(SourceFile:686)
	at atv.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: STRING
	Tag type expected: LIST
	Tag name: Lore
	Tag parent: display
Stacktrace:
	at by.m(SourceFile:201)
	at ye.a(SourceFile:461)
	at awy.a(SourceFile:188)
	at axm.a(SourceFile:580)
	at awy.a(SourceFile:168)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)

-- Screen render details --
Details:
	Screen name: axm
	Mouse location: Scaled: (124, 178). Absolute: (248, 123)
	Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdi['AlphaGuardian'/119, l='MpServer', x=1768.95, y=10.62, z=215.12]]
	Chunk stats: MultiplayerChunkCache: 205
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (1797,4,222), Chunk: (at 5,0,14 in 112,13; contains blocks 1792,0,208 to 1807,255,223), Region: (3,0; contains chunks 96,0 to 127,31, blocks 1536,0,0 to 2047,255,511)
	Level time: 279060 game time, 20083 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: 74 total; [tr['Skeleton'/9, l='MpServer', x=1703.50, y=4.00, z=219.50], tr['Skeleton'/10, l='MpServer', x=1704.50, y=4.00, z=220.50], tr['Skeleton'/11, l='MpServer', x=1701.50, y=4.00, z=221.50], tw['Zombie'/12, l='MpServer', x=1714.72, y=4.00, z=206.97], tt['Spider'/13, l='MpServer', x=1714.59, y=4.00, z=203.73], tt['Spider'/14, l='MpServer', x=1713.03, y=4.00, z=208.06], tf['Creeper'/15, l='MpServer', x=1724.50, y=4.00, z=240.50], tw['Zombie'/17, l='MpServer', x=1719.50, y=4.00, z=274.50], tw['Zombie'/16, l='MpServer', x=1719.50, y=4.00, z=273.50], tw['Zombie'/19, l='MpServer', x=1730.50, y=4.00, z=147.50], tw['Zombie'/18, l='MpServer', x=1722.06, y=4.00, z=275.69], tf['Creeper'/21, l='MpServer', x=1729.50, y=4.00, z=198.50], tf['Creeper'/20, l='MpServer', x=1743.16, y=4.00, z=195.78], tr['Skeleton'/23, l='MpServer', x=1735.72, y=4.00, z=216.00], tt['Spider'/22, l='MpServer', x=1733.94, y=4.00, z=205.38], tr['Skeleton'/25, l='MpServer', x=1734.53, y=4.00, z=214.91], tr['Skeleton'/24, l='MpServer', x=1733.50, y=4.00, z=214.50], tr['Skeleton'/27, l='MpServer', x=1741.22, y=4.00, z=224.31], tr['Skeleton'/26, l='MpServer', x=1728.50, y=4.00, z=230.50], tt['Spider'/28, l='MpServer', x=1735.14, y=4.00, z=239.38], tt['Spider'/31, l='MpServer', x=1754.88, y=4.00, z=214.38], tr['Skeleton'/30, l='MpServer', x=1758.50, y=4.00, z=150.50], tw['Zombie'/34, l='MpServer', x=1745.44, y=4.00, z=278.44], tw['Zombie'/35, l='MpServer', x=1760.50, y=4.00, z=153.50], tf['Creeper'/32, l='MpServer', x=1748.50, y=4.00, z=243.06], tf['Creeper'/33, l='MpServer', x=1750.50, y=4.00, z=270.50], tw['Zombie'/38, l='MpServer', x=1769.94, y=4.00, z=201.59], tf['Creeper'/39, l='MpServer', x=1773.34, y=4.00, z=232.78], tf['Creeper'/36, l='MpServer', x=1760.50, y=4.00, z=158.50], tf['Creeper'/37, l='MpServer', x=1772.16, y=4.00, z=150.84], tw['Zombie'/40, l='MpServer', x=1775.38, y=4.00, z=257.94], tt['Spider'/41, l='MpServer', x=1768.16, y=4.00, z=269.66], ro['Bat'/46, l='MpServer', x=1800.08, y=5.25, z=167.28], ro['Bat'/47, l='MpServer', x=1788.35, y=4.58, z=171.13], ro['Bat'/45, l='MpServer', x=1787.25, y=13.10, z=170.34], ro['Bat'/51, l='MpServer', x=1793.42, y=6.21, z=179.90], ro['Bat'/50, l='MpServer', x=1786.22, y=4.88, z=180.03], ro['Bat'/49, l='MpServer', x=1791.50, y=13.10, z=182.75], tw['Zombie'/48, l='MpServer', x=1790.50, y=15.00, z=182.50], tw['Zombie'/54, l='MpServer', x=1780.00, y=4.00, z=283.00], ry['Pig'/53, l='MpServer', x=1785.78, y=4.00, z=285.47], tt['Spider'/52, l='MpServer', x=1782.50, y=4.00, z=197.13], tt['Spider'/58, l='MpServer', x=1776.81, y=4.00, z=288.59], tw['Zombie'/57, l='MpServer', x=1790.34, y=4.00, z=295.06], ro['Bat'/68, l='MpServer', x=1793.13, y=15.84, z=168.91], ro['Bat'/69, l='MpServer', x=1798.52, y=4.05, z=174.72], ro['Bat'/70, l='MpServer', x=1802.09, y=6.80, z=170.98], ro['Bat'/71, l='MpServer', x=1798.01, y=6.17, z=179.76], ry['Pig'/64, l='MpServer', x=1805.50, y=14.00, z=174.84], tr['Skeleton'/65, l='MpServer', x=1803.50, y=5.00, z=174.50], ro['Bat'/66, l='MpServer', x=1803.59, y=12.10, z=169.25], ro['Bat'/67, l='MpServer', x=1804.25, y=7.10, z=169.44], ro['Bat'/76, l='MpServer', x=1800.34, y=6.62, z=169.50], ro['Bat'/77, l='MpServer', x=1800.00, y=4.30, z=182.25], ro['Bat'/78, l='MpServer', x=1803.75, y=8.00, z=180.51], tw['Zombie'/79, l='MpServer', x=1803.03, y=4.00, z=235.44], ro['Bat'/72, l='MpServer', x=1796.73, y=9.71, z=181.75], tr['Skeleton'/73, l='MpServer', x=1800.50, y=4.00, z=180.50], ro['Bat'/74, l='MpServer', x=1797.46, y=13.15, z=182.97], ro['Bat'/75, l='MpServer', x=1797.11, y=10.19, z=184.25], tw['Zombie'/87, l='MpServer', x=1821.50, y=4.00, z=157.50], tf['Creeper'/86, l='MpServer', x=1818.50, y=4.00, z=158.50], ry['Pig'/80, l='MpServer', x=1804.41, y=4.00, z=294.06], tt['Spider'/93, l='MpServer', x=1836.75, y=4.00, z=240.97], tf['Creeper'/92, l='MpServer', x=1834.97, y=4.00, z=145.44], ry['Pig'/95, l='MpServer', x=1822.14, y=4.00, z=284.53], tf['Creeper'/94, l='MpServer', x=1836.79, y=4.00, z=259.59], tg['Enderman'/91, l='MpServer', x=1836.34, y=4.00, z=149.41], tr['Skeleton'/102, l='MpServer', x=1841.50, y=4.00, z=281.50], tf['Creeper'/98, l='MpServer', x=1840.50, y=4.00, z=148.50], tg['Enderman'/99, l='MpServer', x=1840.50, y=4.00, z=156.50], tr['Skeleton'/96, l='MpServer', x=1837.94, y=4.00, z=272.47], tt['Spider'/97, l='MpServer', x=1838.06, y=4.00, z=272.44], bdi['AlphaGuardian'/119, l='MpServer', x=1768.95, y=10.62, z=215.12]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 188557488 bytes (179 MB) / 484638720 bytes (462 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 9251 (518056 bytes; 0 MB) allocated, 1007 (56392 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2342, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: oCd pack 1.6 by disco.zip
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1237 (69272 bytes; 0 MB) allocated, 181 (10136 bytes; 0 MB) used