Hopper: java.lang.ArrayIndexOutOfBoundsException: -30

java.lang.ArrayIndexOutOfBoundsException: -30
	at axv.a(SourceFile:69)
	at axv.a(SourceFile:45)
	at axt.a(SourceFile:28)
	at bfw.a(SourceFile:1027)
	at fk.a(SourceFile:41)
	at eb.b(SourceFile:63)
	at bfw.e(SourceFile:109)

---- Minecraft Crash Report ----
// Oops.

Time: 9/20/13 5:54 PM
Description: Exception in world tick

java.lang.ArrayIndexOutOfBoundsException: -30
	at axv.a(SourceFile:69)
	at axv.a(SourceFile:45)
	at axt.a(SourceFile:28)
	at bfw.a(SourceFile:1027)
	at fk.a(SourceFile:41)
	at eb.b(SourceFile:63)
	at bfw.e(SourceFile:109)
	at bgc.b(SourceFile:62)
	at awp.o(SourceFile:1491)
	at awp.aa(SourceFile:726)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at axv.a(SourceFile:69)
	at axv.a(SourceFile:45)
	at axt.a(SourceFile:28)
	at bfw.a(SourceFile:1027)
	at fk.a(SourceFile:41)
	at eb.b(SourceFile:63)
	at bfw.e(SourceFile:109)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['R167'/12, l='MpServer', x=-662.85, y=64.12, z=681.17]]
	Chunk stats: MultiplayerChunkCache: 150, 150
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-662,4,683), Chunk: (at 10,0,11 in -42,42; contains blocks -672,0,672 to -657,255,687), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Level time: 250353 game time, 2000 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: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 13 total; [tv['entity.MinecartChest.name'/0, l='MpServer', x=-677.50, y=60.50, z=693.50], pc['entity.ItemFrame.name'/1, l='MpServer', x=-665.50, y=57.50, z=670.94], pc['entity.ItemFrame.name'/2, l='MpServer', x=-666.50, y=56.50, z=670.94], pc['entity.ItemFrame.name'/3, l='MpServer', x=-664.94, y=57.50, z=671.50], pc['entity.ItemFrame.name'/4, l='MpServer', x=-667.06, y=56.50, z=671.50], pc['entity.ItemFrame.name'/5, l='MpServer', x=-667.06, y=57.50, z=671.50], pc['entity.ItemFrame.name'/6, l='MpServer', x=-666.50, y=57.50, z=670.94], tv['entity.MinecartChest.name'/7, l='MpServer', x=-660.50, y=60.50, z=681.47], pc['entity.ItemFrame.name'/8, l='MpServer', x=-666.50, y=57.50, z=672.06], pc['entity.ItemFrame.name'/9, l='MpServer', x=-665.50, y=57.50, z=672.06], pc['entity.ItemFrame.name'/10, l='MpServer', x=-666.50, y=56.50, z=672.06], pc['entity.ItemFrame.name'/11, l='MpServer', x=-665.50, y=56.50, z=672.06], bgh['R167'/12, l='MpServer', x=-662.85, y=64.12, z=681.17]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bgc.a(SourceFile:297)
	at awp.o(SourceFile:1498)
	at awp.aa(SourceFile:726)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['R167'/12, l='MpServer', x=-662.85, y=64.12, z=681.17]]
	Chunk stats: MultiplayerChunkCache: 150, 150
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-662,4,683), Chunk: (at 10,0,11 in -42,42; contains blocks -672,0,672 to -657,255,687), Region: (-2,1; contains chunks -64,32 to -33,63, blocks -1024,0,512 to -513,255,1023)
	Level time: 250353 game time, 2000 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: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 13 total; [tv['entity.MinecartChest.name'/0, l='MpServer', x=-677.50, y=60.50, z=693.50], pc['entity.ItemFrame.name'/1, l='MpServer', x=-665.50, y=57.50, z=670.94], pc['entity.ItemFrame.name'/2, l='MpServer', x=-666.50, y=56.50, z=670.94], pc['entity.ItemFrame.name'/3, l='MpServer', x=-664.94, y=57.50, z=671.50], pc['entity.ItemFrame.name'/4, l='MpServer', x=-667.06, y=56.50, z=671.50], pc['entity.ItemFrame.name'/5, l='MpServer', x=-667.06, y=57.50, z=671.50], pc['entity.ItemFrame.name'/6, l='MpServer', x=-666.50, y=57.50, z=670.94], tv['entity.MinecartChest.name'/7, l='MpServer', x=-660.50, y=60.50, z=681.47], pc['entity.ItemFrame.name'/8, l='MpServer', x=-666.50, y=57.50, z=672.06], pc['entity.ItemFrame.name'/9, l='MpServer', x=-665.50, y=57.50, z=672.06], pc['entity.ItemFrame.name'/10, l='MpServer', x=-666.50, y=56.50, z=672.06], pc['entity.ItemFrame.name'/11, l='MpServer', x=-665.50, y=56.50, z=672.06], bgh['R167'/12, l='MpServer', x=-662.85, y=64.12, z=681.17]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server

-- System Details --
Details:
	Minecraft Version: 13w38c
	Operating System: Mac OS X (x86_64) version 10.8.5
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 102389512 bytes (97 MB) / 272949248 bytes (260 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 20003 (1120168 bytes; 1 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w38c
	LWJGL: 2.9.0
	OpenGL: NVIDIA GeForce 8600M GT OpenGL Engine GL version 2.1 NVIDIA-8.16.74 310.40.00.10f02, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 29 (1624 bytes; 0 MB) allocated, 14 (784 bytes; 0 MB) used