Hopper: java.lang.ClassCastException: we cannot be cast to rh

java.lang.ClassCastException: we cannot be cast to rh
	at uu.e(SourceFile:1171)
	at rh.e(SourceFile:1350)
	at ri.e(SourceFile:295)
	at qk.e(SourceFile:95)
	at ur.e(SourceFile:37)
	at uu.e(SourceFile:972)
	at rh.h(SourceFile:1205)
	at ri.h(SourceFile:171)
	at uu.h(SourceFile:1003)
	at afn.a(SourceFile:1368)
	at mj.a(SourceFile:480)
	at afn.g(SourceFile:1346)

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 10/27/13 11:21 AM
Description: Ticking entity

java.lang.ClassCastException: vv cannot be cast to rh
	at uu.e(SourceFile:1171)
	at rh.e(SourceFile:1350)
	at ri.e(SourceFile:295)
	at qk.e(SourceFile:95)
	at ur.e(SourceFile:37)
	at uu.e(SourceFile:972)
	at rh.h(SourceFile:1205)
	at ri.h(SourceFile:171)
	at uu.h(SourceFile:1003)
	at afn.a(SourceFile:1368)
	at mj.a(SourceFile:480)
	at afn.g(SourceFile:1346)
	at afn.h(SourceFile:1253)
	at mj.h(SourceFile:365)
	at net.minecraft.server.MinecraftServer.u(SourceFile:511)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at uu.e(SourceFile:1171)
	at rh.e(SourceFile:1350)
	at ri.e(SourceFile:295)
	at qk.e(SourceFile:95)
	at ur.e(SourceFile:37)
	at uu.e(SourceFile:972)
	at rh.h(SourceFile:1205)
	at ri.h(SourceFile:171)
	at uu.h(SourceFile:1003)
	at afn.a(SourceFile:1368)
	at mj.a(SourceFile:480)
	at afn.g(SourceFile:1346)

-- Entity being ticked --
Details:
	Entity Type: EntityHorse (uu)
	Entity ID: 112
	Entity Name: Skeleton Horse
	Entity's Exact location: -712.50, 69.00, 1128.50
	Entity's Block location: World: (-713,69,1128), Chunk: (at 7,4,8 in -45,70; contains blocks -720,0,1120 to -705,255,1135), Region: (-2,2; contains chunks -64,64 to -33,95, blocks -1024,0,1024 to -513,255,1535)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at afn.h(SourceFile:1253)
	at mj.h(SourceFile:365)

-- Affected level --
Details:
	Level name: 1.7 update
	All players: 1 total; [mm['Bunn2717'/106, l='1.7 update', x=-712.84, y=68.00, z=1125.32]]
	Chunk stats: ServerChunkCache: 1066 Drop: 0
	Level seed: 9084696108524195527
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (20,64,252), Chunk: (at 4,4,12 in 1,15; contains blocks 16,0,240 to 31,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 63941 game time, 5222 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 46457 (now: false), thunder time: 144617 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:511)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at bsk.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at ky.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 38592704 bytes (36 MB) / 201211904 bytes (191 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1021 (57176 bytes; 0 MB) allocated, 999 (55944 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 137 (7672 bytes; 0 MB) allocated, 132 (7392 bytes; 0 MB) used
	Player Count: 1 / 8; [mm['Bunn2717'/106, l='1.7 update', x=-712.84, y=68.00, z=1125.32]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.