Hopper: java.lang.ClassCastException: vl cannot be cast to ou

java.lang.ClassCastException: vl cannot be cast to ou
	at sh.e(SourceFile:1165)
	at ou.d(SourceFile:1339)
	at ov.d(SourceFile:292)
	at nz.d(SourceFile:93)
	at se.d(SourceFile:35)
	at sh.d(SourceFile:966)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 9/6/13 7:53 PM
Description: Ticking entity

java.lang.ClassCastException: vl cannot be cast to ou
	at sh.e(SourceFile:1165)
	at ou.d(SourceFile:1339)
	at ov.d(SourceFile:292)
	at nz.d(SourceFile:93)
	at se.d(SourceFile:35)
	at sh.d(SourceFile:966)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)
	at act.h(SourceFile:1250)
	at kd.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)


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

-- Head --
Stacktrace:
	at sh.e(SourceFile:1165)
	at ou.d(SourceFile:1339)
	at ov.d(SourceFile:292)
	at nz.d(SourceFile:93)
	at se.d(SourceFile:35)
	at sh.d(SourceFile:966)
	at ou.o_(SourceFile:1194)
	at ov.o_(SourceFile:169)
	at sh.o_(SourceFile:997)
	at act.a(SourceFile:1365)
	at kd.a(SourceFile:479)
	at act.g(SourceFile:1343)

-- Entity being ticked --
Details:
	Entity Type: EntityHorse (sh)
	Entity ID: 192795
	Entity Name: Skeleton Horse
	Entity's Exact location: 1348.50, 4.00, -893.50
	Entity's Block location: World: (1348,4,-894), Chunk: (at 4,0,2 in 84,-56; contains blocks 1344,0,-896 to 1359,255,-881), Region: (2,-2; contains chunks 64,-64 to 95,-33, blocks 1024,0,-1024 to 1535,255,-513)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at act.h(SourceFile:1250)
	at kd.h(SourceFile:364)

-- Affected level --
Details:
	Level name: snapshot
	All players: 1 total; [kg['SenorBobble'/43, l='snapshot', x=1348.06, y=4.00, z=-893.05]]
	Chunk stats: ServerChunkCache: 524 Drop: 0
	Level seed: 70694065038693093
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 
	Level spawn location: World: (1343,4,-906), Chunk: (at 15,0,6 in 83,-57; contains blocks 1328,0,-912 to 1343,255,-897), Region: (2,-2; contains chunks 64,-64 to 95,-33, blocks 1024,0,-1024 to 1535,255,-513)
	Level time: 88149 game time, 9669 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 26066 (now: false), thunder time: 5949 (now: true)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:463)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 158292504 bytes (150 MB) / 446889984 bytes (426 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 769 (43064 bytes; 0 MB) allocated, 620 (34720 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 89 (4984 bytes; 0 MB) allocated, 67 (3752 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['SenorBobble'/43, l='snapshot', x=1348.06, y=4.00, z=-893.05]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.