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Today i was mucking around with MCEDIT in 13w21a and made a horse spawner, now when i go into my world, i crash, this is the crash report, can someone help me be able to access my world again, Thanks

---- Minecraft Crash Report ----
// Sorry

Time: 6/06/13 4:22 PM
Description: Rendering Tile Entity

java.lang.NullPointerException
at aas.a(SourceFile:110)
at aas.h(SourceFile:234)
at bhe.a(SourceFile:22)
at bhe.a(SourceFile:17)
at bhe.a(SourceFile:12)
at bhj.a(SourceFile:106)
at bhj.a(SourceFile:98)
at bdt.a(SourceFile:317)
at bdm.a(SourceFile:836)
at bdm.b(SourceFile:682)
at asx.R(SourceFile:674)
at asx.d(SourceFile:607)
at net.minecraft.client.main.Main.main(SourceFile:78)


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

-- Head --
Stacktrace:
at aas.a(SourceFile:110)
at aas.h(SourceFile:234)
at bhe.a(SourceFile:22)
at bhe.a(SourceFile:17)
at bhe.a(SourceFile:12)

-- Tile Entity Details --
Details:
Name: MobSpawner // arm
Block type: ID #52 (tile.mobSpawner // aol)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (38,63,253), Chunk: (at 6,3,13 in 2,15; contains blocks 32,0,240 to 47,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Actual block type: ID #52 (tile.mobSpawner // aol)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at bhj.a(SourceFile:106)
at bhj.a(SourceFile:98)
at bdt.a(SourceFile:317)
at bdm.a(SourceFile:836)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bbq['fir3face'/280, l='MpServer', x=81.67, y=91.37, z=280.74]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (67,66,261), Chunk: (at 3,4,5 in 4,16; contains blocks 64,0,256 to 79,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 282581 game time, 3918 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: 123 total; [bbq['fir3face'/280, l='MpServer', x=81.67, y=91.37, z=280.74], sn['Creeper'/257, l='MpServer', x=160.06, y=30.00, z=223.53], rh['Sheep'/102, l='MpServer', x=5.78, y=68.00, z=255.59], rh['Sheep'/103, l='MpServer', x=3.53, y=70.00, z=248.06], td['Zombie'/100, l='MpServer', x=2.56, y=21.00, z=243.00], rh['Sheep'/101, l='MpServer', x=12.28, y=68.00, z=238.16], rh['Sheep'/99, l='MpServer', x=9.78, y=70.00, z=226.81], rh['Sheep'/96, l='MpServer', x=14.63, y=72.00, z=220.81], rh['Sheep'/97, l='MpServer', x=3.94, y=69.00, z=232.59], rh['Sheep'/109, l='MpServer', x=4.19, y=81.00, z=316.31], td['Zombie'/106, l='MpServer', x=12.50, y=25.00, z=289.50], tb['Spider'/107, l='MpServer', x=9.50, y=21.00, z=314.50], qy['Chicken'/104, l='MpServer', x=8.34, y=66.72, z=259.51], td['Zombie'/105, l='MpServer', x=13.50, y=25.00, z=287.50], rh['Sheep'/127, l='MpServer', x=21.53, y=62.00, z=256.78], qw['Bat'/126, l='MpServer', x=26.25, y=40.00, z=259.94], qw['Bat'/125, l='MpServer', x=30.49, y=39.45, z=243.60], sz['Skeleton'/124, l='MpServer', x=24.50, y=39.00, z=248.50], rh['Sheep'/123, l='MpServer', x=26.88, y=67.00, z=236.19], qz['Cow'/122, l='MpServer', x=19.25, y=71.00, z=223.19], rh['Sheep'/121, l='MpServer', x=24.50, y=73.00, z=216.34], qz['Cow'/137, l='MpServer', x=33.72, y=68.00, z=223.53], qz['Cow'/136, l='MpServer', x=32.34, y=70.00, z=220.47], sn['Creeper'/139, l='MpServer', x=45.53, y=47.00, z=254.91], sn['Creeper'/138, l='MpServer', x=47.50, y=46.00, z=235.78], sz['Skeleton'/141, l='MpServer', x=46.50, y=41.00, z=265.91], sn['Creeper'/140, l='MpServer', x=40.31, y=46.00, z=256.47], sc['entity.MinecartChest.name'/143, l='MpServer', x=34.50, y=18.50, z=308.09], sn['Creeper'/142, l='MpServer', x=34.53, y=21.00, z=283.25], sn['Creeper'/129, l='MpServer', x=23.44, y=28.00, z=278.00], sz['Skeleton'/128, l='MpServer', x=24.50, y=28.00, z=276.50], qw['Bat'/131, l='MpServer', x=32.88, y=29.66, z=272.45], sz['Skeleton'/130, l='MpServer', x=22.34, y=28.00, z=278.31], rh['Sheep'/132, l='MpServer', x=19.19, y=78.00, z=294.09], td['Zombie'/152, l='MpServer', x=53.59, y=51.00, z=252.94], sz['Skeleton'/153, l='MpServer', x=48.67, y=34.00, z=265.51], td['Zombie'/154, l='MpServer', x=51.50, y=22.00, z=275.03], qw['Bat'/155, l='MpServer', x=62.31, y=43.10, z=287.91], qw['Bat'/156, l='MpServer', x=61.66, y=42.10, z=277.41], td['Zombie'/157, l='MpServer', x=52.59, y=38.00, z=277.94], sz['Skeleton'/158, l='MpServer', x=55.78, y=36.00, z=283.38], sz['Skeleton'/159, l='MpServer', x=53.69, y=37.00, z=273.30], tb['Spider'/147, l='MpServer', x=52.78, y=50.00, z=213.38], sn['Creeper'/148, l='MpServer', x=54.99, y=52.00, z=218.37], rh['Sheep'/149, l='MpServer', x=51.09, y=69.00, z=210.94], sn['Creeper'/150, l='MpServer', x=49.41, y=49.00, z=224.78], td['Zombie'/151, l='MpServer', x=56.50, y=18.00, z=241.50], qw['Bat'/170, l='MpServer', x=56.22, y=50.00, z=300.56], qw['Bat'/169, l='MpServer', x=67.75, y=45.57, z=302.72], rn['Zoro'/168, l='MpServer', x=56.69, y=61.00, z=292.31], sa['item.tile.stone'/163, l='MpServer', x=48.13, y=62.13, z=284.88], td['Zombie'/162, l='MpServer', x=49.64, y=34.00, z=287.59], sz['Skeleton'/161, l='MpServer', x=49.88, y=38.00, z=287.03], tb['Spider'/160, l='MpServer', x=48.39, y=34.00, z=287.02], sn['Creeper'/167, l='MpServer', x=48.41, y=33.00, z=292.56], sn['Creeper'/166, l='MpServer', x=48.31, y=33.00, z=296.00], sz['Skeleton'/165, l='MpServer', x=56.13, y=24.00, z=292.25], sa['item.item.rottenFlesh'/164, l='MpServer', x=52.28, y=15.13, z=293.41], sn['Creeper'/186, l='MpServer', x=71.50, y=28.00, z=218.50], sn['Creeper'/187, l='MpServer', x=61.38, y=13.00, z=246.32], sn['Creeper'/184, l='MpServer', x=78.50, y=27.00, z=211.50], sn['Creeper'/185, l='MpServer', x=76.50, y=27.00, z=210.50], qz['Cow'/188, l='MpServer', x=73.47, y=47.00, z=252.47], sz['Skeleton'/189, l='MpServer', x=79.13, y=55.00, z=259.41], sz['Skeleton'/179, l='MpServer', x=77.53, y=27.00, z=207.38], tb['Spider'/182, l='MpServer', x=70.34, y=24.00, z=211.41], sz['Skeleton'/183, l='MpServer', x=74.59, y=27.00, z=209.84], sc['entity.MinecartChest.name'/181, l='MpServer', x=77.50, y=31.34, z=218.31], sz['Skeleton'/205, l='MpServer', x=75.50, y=37.00, z=336.13], sc['entity.MinecartChest.name'/204, l='MpServer', x=66.50, y=14.34, z=336.19], sz['Skeleton'/201, l='MpServer', x=72.69, y=36.00, z=331.72], sn['Creeper'/200, l='MpServer', x=77.25, y=35.00, z=330.72], sa['item.item.dyePowder.black'/203, l='MpServer', x=78.84, y=59.13, z=330.13], td['Zombie'/202, l='MpServer', x=72.50, y=36.00, z=334.50], sz['Skeleton'/197, l='MpServer', x=68.25, y=41.00, z=277.53], qw['Bat'/196, l='MpServer', x=69.63, y=44.10, z=274.38], sn['Creeper'/199, l='MpServer', x=73.41, y=46.00, z=295.94], sz['Skeleton'/198, l='MpServer', x=75.66, y=43.00, z=272.00], rz['Falling Block'/193, l='MpServer', x=65.50, y=69.49, z=266.50], qw['Bat'/195, l='MpServer', x=77.55, y=26.47, z=264.59], td['Zombie'/194, l='MpServer', x=76.63, y=27.00, z=285.06], rk['Squid'/220, l='MpServer', x=91.63, y=59.34, z=332.84], sa['item.item.dyePowder.black'/221, l='MpServer', x=108.13, y=49.13, z=233.38], td['Zombie'/222, l='MpServer', x=97.50, y=35.00, z=248.50], td['Zombie'/223, l='MpServer', x=96.50, y=35.00, z=246.50], qw['Bat'/216, l='MpServer', x=90.91, y=61.10, z=259.69], rk['Squid'/217, l='MpServer', x=91.50, y=58.06, z=333.50], rk['Squid'/218, l='MpServer', x=89.56, y=58.00, z=335.25], sn['Creeper'/212, l='MpServer', x=82.28, y=22.00, z=248.50], td['Zombie'/213, l='MpServer', x=95.50, y=35.00, z=250.50], td['Zombie'/214, l='MpServer', x=82.72, y=43.00, z=261.13], sn['Creeper'/215, l='MpServer', x=82.50, y=44.00, z=264.50], sc['entity.MinecartChest.name'/209, l='MpServer', x=95.38, y=29.34, z=206.47], qw['Bat'/210, l='MpServer', x=84.75, y=31.10, z=236.50], qw['Bat'/211, l='MpServer', x=82.75, y=28.10, z=230.13], td['Zombie'/239, l='MpServer', x=119.73, y=36.00, z=256.69], td['Zombie'/238, l='MpServer', x=132.50, y=36.00, z=253.50], td['Zombie'/237, l='MpServer', x=125.91, y=36.00, z=250.28], sz['Skeleton'/236, l='MpServer', x=130.50, y=36.00, z=248.50], qw['Bat'/235, l='MpServer', x=139.38, y=34.10, z=229.75], sz['Skeleton'/234, l='MpServer', x=134.94, y=33.00, z=218.63], qw['Bat'/232, l='MpServer', x=115.03, y=23.55, z=316.67], qz['Cow'/231, l='MpServer', x=121.47, y=63.00, z=243.56], rh['Sheep'/230, l='MpServer', x=122.13, y=63.00, z=232.28], td['Zombie'/229, l='MpServer', x=115.97, y=30.00, z=211.53], sn['Creeper'/228, l='MpServer', x=115.50, y=27.00, z=208.50], td['Zombie'/227, l='MpServer', x=120.44, y=28.00, z=204.44], td['Zombie'/225, l='MpServer', x=103.00, y=35.00, z=295.56], td['Zombie'/224, l='MpServer', x=101.03, y=35.00, z=252.50], qw['Bat'/252, l='MpServer', x=157.02, y=31.69, z=318.26], sn['Creeper'/253, l='MpServer', x=148.00, y=31.00, z=332.44], rh['Sheep'/250, l='MpServer', x=141.86, y=63.00, z=229.77], qw['Bat'/251, l='MpServer', x=142.91, y=28.60, z=310.23], qw['Bat'/248, l='MpServer', x=152.82, y=32.77, z=228.19], rh['Sheep'/249, l='MpServer', x=147.50, y=63.00, z=237.50], sn['Creeper'/246, l='MpServer', x=154.50, y=31.00, z=232.50], sn['Creeper'/247, l='MpServer', x=157.47, y=33.00, z=233.00], sz['Skeleton'/244, l='MpServer', x=137.98, y=36.00, z=302.44], sz['Skeleton'/245, l='MpServer', x=129.94, y=33.00, z=310.53], sz['Skeleton'/242, l='MpServer', x=136.64, y=35.00, z=302.99], sz['Skeleton'/243, l='MpServer', x=135.78, y=35.00, z=303.69], qw['Bat'/240, l='MpServer', x=143.25, y=42.10, z=266.75], td['Zombie'/241, l='MpServer', x=131.56, y=43.00, z=264.84]]
Retry entities: 0 total; []
Stacktrace:
at bbn.a(SourceFile:282)
at asx.b(SourceFile:1793)
at asx.d(SourceFile:616)
at net.minecraft.client.main.Main.main(SourceFile:78)

-- System Details --
Details:
Minecraft Version: 13w21b
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 59940336 bytes (57 MB) / 213401600 bytes (203 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 15302 (856912 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
LWJGL: 2.9.0
OpenGL: ATI Radeon HD 5400 Series GL version 4.1.10524 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 4126 (231056 bytes; 0 MB) allocated, 171 (9576 bytes; 0 MB) used

Go into MCedit, and delete the spawner you created. Save, and try the world in MC again.