Crashing when creating a map

Im crashing when i try to make a bigger map

---- Minecraft Crash Report ----
// Don't do that.

Time: 07-04-14 15:46
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
	at ace.d(SourceFile:221)
	at aca.a(SourceFile:336)
	at zu.b(SourceFile:41)
	at zu.a(SourceFile:58)
	at yp.a(SourceFile:238)
	at bkf.a(SourceFile:308)
	at bdq.a(SourceFile:490)
	at bdq.a(SourceFile:318)
	at bco.d(SourceFile:232)
	at bco.k(SourceFile:211)
	at azl.p(SourceFile:1303)
	at azl.ah(SourceFile:757)
	at azl.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:148)


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

-- Head --
Stacktrace:
	at ace.d(SourceFile:221)
	at aca.a(SourceFile:336)
	at zu.b(SourceFile:41)
	at zu.a(SourceFile:58)
	at yp.a(SourceFile:238)
	at bkf.a(SourceFile:308)
	at bdq.a(SourceFile:490)
	at bdq.a(SourceFile:318)
	at bco.d(SourceFile:232)
	at bco.k(SourceFile:211)

-- Affected screen --
Details:
	Screen name: bec

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bkl['sarsum33'/58125, l='MpServer', x=-607,64, y=6,62, z=279,22]]
	Chunk stats: MultiplayerChunkCache: 441, 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-589,6,283), Chunk: (at 3,0,11 in -37,17; contains blocks -592,0,272 to -577,255,287), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
	Level time: 56298187 game time, 70920000 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: 66 total; [bkl['sarsum33'/58125, l='MpServer', x=-607,64, y=6,62, z=279,22], rq['entity.ItemFrame.name'/39, l='MpServer', x=-638,50, y=7,50, z=284,06], rq['entity.ItemFrame.name'/42, l='MpServer', x=-637,50, y=7,50, z=284,06], rq['entity.ItemFrame.name'/43, l='MpServer', x=-635,94, y=7,50, z=280,50], rq['entity.ItemFrame.name'/40, l='MpServer', x=-638,50, y=7,50, z=284,06], rq['entity.ItemFrame.name'/41, l='MpServer', x=-639,50, y=7,50, z=284,06], rq['entity.ItemFrame.name'/46, l='MpServer', x=-624,94, y=7,50, z=275,50], rq['entity.ItemFrame.name'/47, l='MpServer', x=-624,94, y=7,50, z=274,50], rq['entity.ItemFrame.name'/44, l='MpServer', x=-635,94, y=7,50, z=279,50], rq['entity.ItemFrame.name'/45, l='MpServer', x=-624,94, y=7,50, z=276,50], rq['entity.ItemFrame.name'/51, l='MpServer', x=-637,50, y=7,50, z=286,94], rq['entity.ItemFrame.name'/50, l='MpServer', x=-638,50, y=7,50, z=286,94], rq['entity.ItemFrame.name'/49, l='MpServer', x=-639,50, y=7,50, z=286,94], rq['entity.ItemFrame.name'/48, l='MpServer', x=-624,94, y=7,50, z=273,50], rq['entity.ItemFrame.name'/55, l='MpServer', x=-635,50, y=7,50, z=276,06], rq['entity.ItemFrame.name'/54, l='MpServer', x=-636,50, y=7,50, z=276,06], rq['entity.ItemFrame.name'/53, l='MpServer', x=-635,94, y=7,50, z=282,50], rq['entity.ItemFrame.name'/52, l='MpServer', x=-635,94, y=7,50, z=281,50], rq['entity.ItemFrame.name'/59, l='MpServer', x=-638,06, y=7,50, z=273,50], rq['entity.ItemFrame.name'/58, l='MpServer', x=-638,06, y=7,50, z=272,50], rq['entity.ItemFrame.name'/57, l='MpServer', x=-633,50, y=7,50, z=276,06], rq['entity.ItemFrame.name'/56, l='MpServer', x=-634,50, y=7,50, z=276,06], rq['entity.ItemFrame.name'/63, l='MpServer', x=-639,50, y=7,50, z=277,94], rq['entity.ItemFrame.name'/62, l='MpServer', x=-638,50, y=7,50, z=277,94], rq['entity.ItemFrame.name'/61, l='MpServer', x=-637,50, y=7,50, z=277,94], rq['entity.ItemFrame.name'/60, l='MpServer', x=-638,06, y=7,50, z=274,50], rq['entity.ItemFrame.name'/68, l='MpServer', x=-627,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/69, l='MpServer', x=-627,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/70, l='MpServer', x=-626,94, y=7,50, z=290,50], rq['entity.ItemFrame.name'/71, l='MpServer', x=-626,94, y=7,50, z=291,50], rq['entity.ItemFrame.name'/64, l='MpServer', x=-629,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/65, l='MpServer', x=-628,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/66, l='MpServer', x=-626,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/67, l='MpServer', x=-626,50, y=7,50, z=278,06], rq['entity.ItemFrame.name'/76, l='MpServer', x=-633,06, y=7,50, z=292,50], rq['entity.ItemFrame.name'/77, l='MpServer', x=-633,06, y=7,50, z=292,50], rq['entity.ItemFrame.name'/78, l='MpServer', x=-635,94, y=7,50, z=291,50], rq['entity.ItemFrame.name'/79, l='MpServer', x=-635,94, y=7,50, z=290,50], rq['entity.ItemFrame.name'/72, l='MpServer', x=-626,94, y=7,50, z=292,50], rq['entity.ItemFrame.name'/73, l='MpServer', x=-626,94, y=7,50, z=293,50], rq['entity.ItemFrame.name'/74, l='MpServer', x=-633,06, y=7,50, z=290,50], rq['entity.ItemFrame.name'/75, l='MpServer', x=-633,06, y=7,50, z=291,50], rq['entity.ItemFrame.name'/85, l='MpServer', x=-608,94, y=7,50, z=283,50], vl['Pig'/84, l='MpServer', x=-608,19, y=20,00, z=262,84], rq['entity.ItemFrame.name'/87, l='MpServer', x=-608,94, y=7,50, z=282,50], rq['entity.ItemFrame.name'/86, l='MpServer', x=-608,94, y=8,50, z=282,50], rq['entity.ItemFrame.name'/81, l='MpServer', x=-635,94, y=7,50, z=288,50], rq['entity.ItemFrame.name'/80, l='MpServer', x=-635,94, y=7,50, z=289,50], rq['entity.ItemFrame.name'/82, l='MpServer', x=-628,50, y=7,50, z=288,94], rq['entity.ItemFrame.name'/93, l='MpServer', x=-608,94, y=6,50, z=281,50], rq['entity.ItemFrame.name'/92, l='MpServer', x=-608,94, y=7,50, z=281,50], rq['entity.ItemFrame.name'/95, l='MpServer', x=-608,94, y=8,50, z=281,50], rq['entity.ItemFrame.name'/94, l='MpServer', x=-608,94, y=5,50, z=281,50], rq['entity.ItemFrame.name'/89, l='MpServer', x=-608,94, y=5,50, z=282,50], rq['entity.ItemFrame.name'/88, l='MpServer', x=-608,94, y=6,50, z=282,50], rq['entity.ItemFrame.name'/91, l='MpServer', x=-608,94, y=6,50, z=283,50], rq['entity.ItemFrame.name'/90, l='MpServer', x=-608,94, y=5,50, z=283,50], vm['Sheep'/102, l='MpServer', x=-601,13, y=17,00, z=256,69], vm['Sheep'/103, l='MpServer', x=-582,63, y=27,00, z=233,53], rq['entity.ItemFrame.name'/100, l='MpServer', x=-608,94, y=7,50, z=279,50], rq['entity.ItemFrame.name'/101, l='MpServer', x=-608,94, y=9,50, z=281,50], rq['entity.ItemFrame.name'/98, l='MpServer', x=-608,94, y=6,50, z=280,50], rq['entity.ItemFrame.name'/99, l='MpServer', x=-608,94, y=8,50, z=279,50], rq['entity.ItemFrame.name'/96, l='MpServer', x=-608,94, y=8,50, z=280,50], rq['entity.ItemFrame.name'/97, l='MpServer', x=-608,94, y=7,50, z=280,50], vm['Sheep'/104, l='MpServer', x=-595,66, y=13,00, z=257,88]]
	Retry entities: 0 total; []
	Server brand: CraftBukkit
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bkg.a(SourceFile:289)
	at azl.b(SourceFile:1947)
	at azl.f(SourceFile:720)
	at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
	Minecraft Version: 1.7.5
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 287893288 bytes (274 MB) / 546308096 bytes (521 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.5-1.7.5
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.3347, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: [Sphax PureBDcraft 128x MC17.zip, TEAVSRP2.zip]
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)