Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at asp.q(SourceFile:131)
	at asp.a(SourceFile:168)
	at bjd.a(SourceFile:111)
	at bfd.a(SourceFile:18)
	at bfr.a(SourceFile:6913)
	at bgw.a(SourceFile:284)
	at bgw.b(SourceFile:333)
	at awy.a(SourceFile:332)
	at awy.a(SourceFile:109)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 20/09/13 21:03
Description: Rendering screen

java.lang.NullPointerException
	at asp.q(SourceFile:131)
	at asp.a(SourceFile:168)
	at bjd.a(SourceFile:111)
	at bfd.a(SourceFile:18)
	at bfr.a(SourceFile:6913)
	at bgw.a(SourceFile:284)
	at bgw.b(SourceFile:333)
	at awy.a(SourceFile:332)
	at awy.a(SourceFile:109)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)
	at bfe.b(SourceFile:718)
	at atv.S(SourceFile:686)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at asp.q(SourceFile:131)
	at asp.a(SourceFile:168)
	at bjd.a(SourceFile:111)
	at bfd.a(SourceFile:18)
	at bfr.a(SourceFile:6913)
	at bgw.a(SourceFile:284)
	at bgw.b(SourceFile:333)
	at awy.a(SourceFile:332)
	at awy.a(SourceFile:109)
	at axp.a(SourceFile:31)
	at axm.a(SourceFile:529)

-- Screen render details --
Details:
	Screen name: axm
	Mouse location: Scaled: (172, 53). Absolute: (516, 608)
	Screen size: Scaled: (456, 256). Absolute: (1366, 768). Scale factor of 3

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdi['hippo_explores'/179204, l='MpServer', x=102.78, y=67.62, z=-24.78]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (82,4,-14), Chunk: (at 2,0,2 in 5,-1; contains blocks 80,0,-16 to 95,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 78308 game time, 460468 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; [su['entity.MinecartChest.name'/179170, l='MpServer', x=168.50, y=26.50, z=-7.50], ro['Bat'/183623, l='MpServer', x=158.88, y=21.10, z=-17.25], ro['Bat'/184263, l='MpServer', x=141.53, y=28.10, z=-41.50], ro['Bat'/182347, l='MpServer', x=177.25, y=28.10, z=0.41], ro['Bat'/184740, l='MpServer', x=140.44, y=27.10, z=-33.09], bdi['hippo_explores'/179204, l='MpServer', x=102.78, y=67.62, z=-24.78], sc['Squid'/179159, l='MpServer', x=99.34, y=60.07, z=-38.37], ro['Bat'/184739, l='MpServer', x=135.88, y=27.10, z=-31.50], sc['Squid'/179158, l='MpServer', x=99.53, y=60.41, z=-37.47], ro['Bat'/184737, l='MpServer', x=142.75, y=29.83, z=-35.54], ro['Bat'/184033, l='MpServer', x=165.42, y=27.78, z=-13.25], ro['Bat'/182342, l='MpServer', x=166.13, y=27.10, z=-11.34], ro['Bat'/184989, l='MpServer', x=179.25, y=30.00, z=-17.25]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_30, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
	Memory: 137928 bytes (0 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 716 (40096 bytes; 0 MB) allocated, 146 (8176 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 8.15.10.2752, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Sphax PureBDcraft  64x MC16.zip
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 738 (41328 bytes; 0 MB) allocated, 123 (6888 bytes; 0 MB) used