I do not know what is going on..

When you open the UI of horses crash

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 13. 7. 7 오후 2:07
Description: Ticking memory connection

java.lang.ArrayIndexOutOfBoundsException: 2
at mr.a(SourceFile:33)
at vz.d(SourceFile:69)
at ut.a(SourceFile:63)
at ut.a(SourceFile:52)
at js.a(SourceFile:488)
at rp.f(SourceFile:710)
at rp.a(SourceFile:729)
at od.c(SourceFile:761)
at ua.p(SourceFile:813)
at jx.a(NetServerHandler.java:751)
at eg.a(SourceFile:36)
at cm.b(SourceFile:64)
at jx.d(NetServerHandler.java:70)
at ka.b(SourceFile:37)
at bkr.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.t(SourceFile:488)
at net.minecraft.server.MinecraftServer.s(SourceFile:405)
at bko.s(SourceFile:124)
at net.minecraft.server.MinecraftServer.run(SourceFile:339)
at hf.run(SourceFile:582)

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

– Head –
Stacktrace:
at mr.a(SourceFile:33)
at vz.d(SourceFile:69)
at ut.a(SourceFile:63)
at ut.a(SourceFile:52)
at js.a(SourceFile:488)
at rp.f(SourceFile:710)
at rp.a(SourceFile:729)
at od.c(SourceFile:761)
at ua.p(SourceFile:813)
at jx.a(NetServerHandler.java:751)
at eg.a(SourceFile:36)
at cm.b(SourceFile:64)
at jx.d(NetServerHandler.java:70)

– Ticking connection –
Details:
Connection: jx@ce4b94
Stacktrace:
at ka.b(SourceFile:37)
at bkr.b(SourceFile:84)
at net.minecraft.server.MinecraftServer.t(SourceFile:488)
at net.minecraft.server.MinecraftServer.s(SourceFile:405)
at bko.s(SourceFile:124)
at net.minecraft.server.MinecraftServer.run(SourceFile:339)
at hf.run(SourceFile:582)

– System Details –
Details:
Minecraft Version: 1.6.1
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 186660128 bytes (178 MB) / 394928128 bytes (376 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 1695 (94920 bytes; 0 MB) allocated, 1292 (72352 bytes; 0 MB) used
Suspicious classes: VoxelMapProtectedShizHelper[com.thevoxelbox.voxelmap.VoxelMap, VoxelRadar, VoxelColorManager, ...], [com.thevoxelbox.voxelmap.util.GLBufferedImage, GuiScreenMinimap, GuiMinimap, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Vec3 Pool Size: 772 (43232 bytes; 0 MB) allocated, 672 (37632 bytes; 0 MB) used
Player Count: 1 / 8; [js['DOMANG_'/107, l='13w10a', x=1032.30, y=56.00, z=-644.13]]
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated