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

java.lang.ClassCastException: ce cannot be cast to bw
	at bx.c(SourceFile:111)
	at sq.a(SourceFile:186)
	at nm.f(SourceFile:1062)
	at abm.a(SourceFile:116)
	at abm.g(SourceFile:92)
	at sy.l_(SourceFile:75)
	at nm.U(SourceFile:1165)
	at abv.a(SourceFile:1347)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.h(SourceFile:1234)
	at jr.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 9/10/13 7:59 AM
Description: Reading NBT data

java.lang.ClassCastException: ce cannot be cast to bw
	at bx.c(SourceFile:111)
	at sq.a(SourceFile:186)
	at nm.f(SourceFile:1062)
	at abm.a(SourceFile:116)
	at abm.g(SourceFile:92)
	at sy.l_(SourceFile:75)
	at nm.U(SourceFile:1165)
	at abv.a(SourceFile:1347)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.h(SourceFile:1234)
	at jr.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)


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: BYTE
	Tag name: Time
Stacktrace:
	at bx.c(SourceFile:111)
	at sq.a(SourceFile:186)

-- Entity being loaded --
Details:
	Entity Type: FallingSand (sq)
	Entity ID: 1135710
	Entity Name: Falling Block
	Entity's Exact location: 363.00, 56.00, -4.00
	Entity's Block location: World: (363,56,-4), Chunk: (at 11,3,12 in 22,-1; contains blocks 352,0,-16 to 367,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, 0.00, 0.00
	Immitating block ID: 66
	Immitating block data: 0
Stacktrace:
	at nm.f(SourceFile:1062)
	at abm.a(SourceFile:116)
	at abm.g(SourceFile:92)
	at sy.l_(SourceFile:75)
	at nm.U(SourceFile:1165)
	at abv.a(SourceFile:1347)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)
	at abv.a(SourceFile:1386)
	at jr.a(SourceFile:479)
	at abv.g(SourceFile:1327)

-- Entity being ticked --
Details:
	Entity Type: MinecartRideable (sx)
	Entity ID: 1135682
	Entity Name: entity.MinecartRideable.name
	Entity's Exact location: 363.50, 56.50, -3.80
	Entity's Block location: World: (363,56,-4), Chunk: (at 11,3,12 in 22,-1; contains blocks 352,0,-16 to 367,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Entity's Momentum: 0.00, 0.00, -0.17
Stacktrace:
	at abv.h(SourceFile:1234)
	at jr.h(SourceFile:364)

-- Affected level --
Details:
	Level name: try with seth
	All players: 1 total; [ju['MaxTheAwesomeOne'/1135685, l='try with seth', x=360.28, y=66.73, z=7.15]]
	Chunk stats: ServerChunkCache: 646 Drop: 0
	Level seed: 2896162464071287349
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 2;7,3x1,52x24;2;
	Level spawn location: World: (348,4,50), Chunk: (at 12,0,2 in 21,3; contains blocks 336,0,48 to 351,255,63), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 14994 game time, 14994 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 159231 (now: false), thunder time: 148031 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_10, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 215231784 bytes (205 MB) / 408879104 bytes (389 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 62 (3472 bytes; 0 MB) allocated, 44 (2464 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 28 (1568 bytes; 0 MB) allocated, 28 (1568 bytes; 0 MB) used
	Player Count: 1 / 8; [ju['MaxTheAwesomeOne'/1135685, l='try with seth', x=360.28, y=66.73, z=7.15]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.