ClassCastException.java

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 21-1-14 20:16
Description: Unexpected error

java.lang.ClassCastException: vv cannot be cast to rh
	at biv.a(SourceFile:464)
	at ft.a(SourceFile:44)
	at ft.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at biy.e(SourceFile:212)
	at azd.o(SourceFile:1281)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
	at biv.a(SourceFile:464)
	at ft.a(SourceFile:44)
	at ft.a(SourceFile:10)
	at ef.a(SourceFile:164)
	at biy.e(SourceFile:212)

-- Affected level --
Details:
	Level name: MpServer
	All players: 3 total; [bje['clankstar'/535730, l='MpServer', x=24,70, y=123,62, z=-2,54], bld['justinbohan300'/508, l='MpServer', x=12,91, y=120,53, z=1,41], bld['Pumpkinhem'/807, l='MpServer', x=-9,88, y=126,00, z=1,59]]
	Chunk stats: MultiplayerChunkCache: 441, 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-9,126,0), Chunk: (at 7,7,0 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 79164 game time, 121133 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: adventure (ID 2). Hardcore: false. Cheats: false
	Forced entities: 15 total; [bld['Pumpkinhem'/807, l='MpServer', x=-9,88, y=126,00, z=1,59], vw['item.item.reeds'/2187, l='MpServer', x=12,34, y=127,13, z=14,12], bld['Pumpkinhem'/807, l='MpServer', x=-9,88, y=126,00, z=1,59], vw['item.item.reeds'/1835, l='MpServer', x=13,59, y=126,63, z=10,31], bje['clankstar'/535730, l='MpServer', x=24,70, y=123,62, z=-2,54], vv['Falling Block'/986, l='MpServer', x=-9,00, y=126,49, z=0,00], bld['justinbohan300'/508, l='MpServer', x=12,91, y=120,53, z=1,41], vw['item.item.reeds'/1820, l='MpServer', x=-2,19, y=124,13, z=5,47], bld['justinbohan300'/508, l='MpServer', x=12,91, y=120,53, z=1,41], vw['item.item.reeds'/1938, l='MpServer', x=3,19, y=124,13, z=5,47], vv['Falling Block'/990, l='MpServer', x=16,38, y=113,49, z=15,03], vv['Falling Block'/520, l='MpServer', x=6,50, y=106,49, z=26,63], vv['Falling Block'/711, l='MpServer', x=4,31, y=129,49, z=-13,31], vw['item.tile.flower2.poppy'/1808, l='MpServer', x=-5,12, y=123,22, z=-4,94], vw['item.item.reeds'/2145, l='MpServer', x=10,69, y=121,13, z=9,47]]
	Retry entities: 0 total; []
	Server brand: CraftBukkit
	Server type: Non-integrated multiplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:718)
	at net.minecraft.client.main.Main.main(SourceFile:103)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 106994256 bytes (102 MB) / 359661568 bytes (343 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 321 (17976 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 1.7.2-OptiFine_HD_U_C2
	LWJGL: 2.9.0
	OpenGL: AMD Radeon R9 200 Series GL version 4.3.12614 Compatibility Profile Context 13.250.18.0, ATI Technologies Inc.
	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1350 (75600 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)