My world crashed

How do I get back to my world? I am quite in love with me castle and it would sadden me to not return to it.
Thank you

Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]). Please attach it so that we can diagnose your issue.

For technical support please use the Mojang Support Center.

Minecraft Crash Report ----
// But it works on my machine.

Time: 6/5/14 2:07 PM
Description: Rendering item

java.lang.ArrayIndexOutOfBoundsException: 6
at akn.a(SourceFile:149)
at ach.b_(SourceFile:19)
at ada.j(SourceFile:407)
at adc.c(SourceFile:99)
at bqk.a(SourceFile:285)
at bqk.b(SourceFile:400)
at bbu.a(SourceFile:744)
at bbu.a(SourceFile:123)
at bof.b(SourceFile:834)
at ban.ak(SourceFile:801)
at ban.f(SourceFile:728)
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 akn.a(SourceFile:149)
at ach.b_(SourceFile:19)
at ada.j(SourceFile:407)
at adc.c(SourceFile:99)
at bqk.a(SourceFile:285)

– Item being rendered –
Details:
Item Type: ach@1c68dc6
Item Aux: 6
Item NBT: null
Item Foil: false
Stacktrace:
at bqk.b(SourceFile:400)
at bbu.a(SourceFile:744)
at bbu.a(SourceFile:123)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [blw['Kongleefeo'/326, l='MpServer', x=235.60, y=90.62, z=212.13]]
Chunk stats: MultiplayerChunkCache: 10, 10
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (148,64,304), Chunk: (at 4,4,0 in 9,19; contains blocks 144,0,304 to 159,255,319), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1432825 game time, 1434335 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 21 total; [ta['Painting'/242, l='MpServer', x=265.50, y=93.00, z=200.06], wh['Horse'/175, l='MpServer', x=208.09, y=90.00, z=209.72], ta['Painting'/245, l='MpServer', x=266.00, y=106.50, z=200.06], wh['Horse'/174, l='MpServer', x=218.88, y=90.50, z=209.91], wh['Donkey'/173, l='MpServer', x=214.28, y=89.00, z=202.41], yk['Skeleton'/197, l='MpServer', x=234.31, y=78.00, z=195.38], yp['Zombie'/225, l='MpServer', x=248.88, y=95.00, z=202.38], blw['Kongleefeo'/326, l='MpServer', x=235.60, y=90.62, z=212.13], wd['Bat'/178, l='MpServer', x=220.88, y=23.78, z=237.16], ta['Painting'/246, l='MpServer', x=268.50, y=106.50, z=200.06], ta['Painting'/247, l='MpServer', x=269.50, y=106.50, z=200.06], ta['Painting'/246, l='MpServer', x=268.50, y=106.50, z=200.06], ta['Painting'/244, l='MpServer', x=263.06, y=105.50, z=204.00], wh['Horse'/176, l='MpServer', x=216.94, y=90.50, z=212.09], ta['Painting'/247, l='MpServer', x=269.50, y=106.50, z=200.06], ta['Painting'/245, l='MpServer', x=266.00, y=106.50, z=200.06], ta['Painting'/244, l='MpServer', x=263.06, y=105.50, z=204.00], wh['Horse'/177, l='MpServer', x=210.81, y=90.00, z=208.44], ta['Painting'/242, l='MpServer', x=265.50, y=93.00, z=200.06], yp['Zombie'/243, l='MpServer', x=256.50, y=84.00, z=200.50], yo['Witch'/241, l='MpServer', x=258.56, y=79.00, z=201.91]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at blr.a(SourceFile:289)
at ban.b(SourceFile:1972)
at ban.f(SourceFile:737)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.9
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 81938840 bytes (78 MB) / 212631552 bytes (202 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 13, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 1.7.9
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 2000 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: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: ~_ERROR~ NullPointerException: null
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)