A few days ago my world worked perfectly but now i cant log in it.

---- Minecraft Crash Report ----
// Why did you do that?

Time: 4/30/14 2:37 PM
Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
	at cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)
	at bxl.b(SourceFile:937)
	at bjf.ai(SourceFile:828)
	at bjf.f(SourceFile:755)
	at net.minecraft.client.main.Main.main(SourceFile:121)


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

-- Head --
Stacktrace:
	at cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)

-- Entity being rendered --
Details:
	Entity Type: ItemFrame (uh)
	Entity ID: 14
	Entity Name: entity.ItemFrame.name
	Entity's Exact location: 3962.50, 78.50, 2416.03
	Entity's Block location: 3962.00,78.00,2416.00 - World: (3962,78,2416), Chunk: (at 10,4,0 in 247,151; contains blocks 3952,0,2416 to 3967,255,2431), Region: (7,4; contains chunks 224,128 to 255,159, blocks 3584,0,2048 to 4095,255,2559)
	Entity's Momentum: 0.00, 0.00, 0.00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null

-- Renderer details --
Details:
	Assigned renderer: cce@64a30643
	Location: -4.38,0.50,-6.83 - World: (-5,0,-7), Chunk: (at 11,0,9 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Rotation: 0.0
	Delta: 0.854928
Stacktrace:
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bxb['piluvee'/13, l='MpServer', x=3966.88, y=78.00, z=2422.86]]
	Chunk stats: MultiplayerChunkCache: 110, 110
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 79.00,64.00,-151.00 - World: (79,64,-151), Chunk: (at 15,4,9 in 4,-10; contains blocks 64,0,-160 to 79,255,-145), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 1779209 game time, 1660744 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: true), thunder time: 0 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 119 total; [yb['Cow'/283, l='MpServer', x=3972.72, y=77.00, z=2401.44], yb['Cow'/282, l='MpServer', x=3969.91, y=77.00, z=2405.66], yb['Cow'/281, l='MpServer', x=3973.53, y=77.00, z=2405.81], yb['Cow'/280, l='MpServer', x=3973.50, y=77.00, z=2404.63], up['Painting'/287, l='MpServer', x=3973.97, y=79.50, z=2427.50], up['Painting'/286, l='MpServer', x=3973.97, y=79.50, z=2429.00], uh['entity.ItemFrame.name'/14, l='MpServer', x=3962.50, y=78.50, z=2416.03], yb['Cow'/285, l='MpServer', x=3969.65, y=77.00, z=2406.34], uh['entity.ItemFrame.name'/15, l='MpServer', x=3961.50, y=78.50, z=2416.03], yb['Cow'/284, l='MpServer', x=3972.59, y=77.00, z=2406.53], uh['entity.ItemFrame.name'/17, l='MpServer', x=3958.50, y=78.50, z=2416.03], uh['entity.ItemFrame.name'/16, l='MpServer', x=3959.50, y=78.50, z=2416.03], uh['entity.ItemFrame.name'/19, l='MpServer', x=3958.03, y=78.50, z=2418.50], uh['entity.ItemFrame.name'/18, l='MpServer', x=3958.03, y=78.50, z=2417.50], up['Painting'/262, l='MpServer', x=3962.00, y=79.50, z=2414.03], uh['entity.ItemFrame.name'/21, l='MpServer', x=3958.03, y=79.50, z=2421.50], up['Painting'/263, l='MpServer', x=3966.50, y=79.50, z=2438.97], uh['entity.ItemFrame.name'/20, l='MpServer', x=3958.03, y=79.50, z=2420.50], uh['entity.ItemFrame.name'/23, l='MpServer', x=3958.03, y=78.50, z=2420.50], uh['entity.ItemFrame.name'/22, l='MpServer', x=3958.03, y=78.50, z=2421.50], up['Painting'/288, l='MpServer', x=3971.50, y=79.50, z=2438.97], uh['entity.ItemFrame.name'/25, l='MpServer', x=3959.50, y=78.50, z=2422.97], ya['Chicken'/267, l='MpServer', x=3962.19, y=62.28, z=2500.72], up['Painting'/286, l='MpServer', x=3973.97, y=79.50, z=2429.00], uh['entity.ItemFrame.name'/24, l='MpServer', x=3958.50, y=78.50, z=2422.97], zy['Creeper'/813, l='MpServer', x=4028.50, y=62.00, z=2392.50], up['Painting'/264, l='MpServer', x=3966.03, y=79.50, z=2443.50], up['Painting'/287, l='MpServer', x=3973.97, y=79.50, z=2427.50], uh['entity.ItemFrame.name'/27, l='MpServer', x=3962.50, y=78.50, z=2422.97], up['Painting'/265, l='MpServer', x=3966.03, y=80.00, z=2445.50], uh['entity.ItemFrame.name'/26, l='MpServer', x=3961.50, y=78.50, z=2422.97], uh['entity.ItemFrame.name'/29, l='MpServer', x=3958.03, y=79.50, z=2417.50], up['Painting'/32, l='MpServer', x=3962.00, y=79.50, z=2423.97], uh['entity.ItemFrame.name'/28, l='MpServer', x=3958.03, y=79.50, z=2418.50], up['Painting'/31, l='MpServer', x=3963.00, y=79.50, z=2425.03], up['Painting'/30, l='MpServer', x=3959.00, y=79.50, z=2423.97], up['Painting'/31, l='MpServer', x=3963.00, y=79.50, z=2425.03], up['Painting'/30, l='MpServer', x=3959.00, y=79.50, z=2423.97], uh['entity.ItemFrame.name'/34, l='MpServer', x=3967.97, y=79.50, z=2430.50], ya['Chicken'/305, l='MpServer', x=3987.69, y=63.00, z=2493.25], up['Painting'/32, l='MpServer', x=3962.00, y=79.50, z=2423.97], uh['entity.ItemFrame.name'/33, l='MpServer', x=3967.97, y=79.50, z=2431.50], xy['Bat'/519, l='MpServer', x=3892.06, y=28.00, z=2427.28], xy['Bat'/520, l='MpServer', x=3893.75, y=28.47, z=2426.25], bxb['piluvee'/13, l='MpServer', x=3966.88, y=78.00, z=2422.86], up['Painting'/288, l='MpServer', x=3971.50, y=79.50, z=2438.97], up['Painting'/289, l='MpServer', x=3973.97, y=79.50, z=2443.50], up['Painting'/290, l='MpServer', x=3973.97, y=79.50, z=2445.00], up['Painting'/291, l='MpServer', x=3973.97, y=80.00, z=2442.50], zy['Creeper'/292, l='MpServer', x=3978.50, y=15.00, z=2472.50], zy['Creeper'/293, l='MpServer', x=3979.50, y=15.00, z=2473.50], xy['Bat'/768, l='MpServer', x=4040.68, y=17.29, z=2473.32], xy['Bat'/769, l='MpServer', x=4044.33, y=16.64, z=2472.76], yk['Sheep'/338, l='MpServer', x=4029.72, y=73.00, z=2482.72], yk['Sheep'/337, l='MpServer', x=4025.59, y=63.00, z=2491.06], zg['item.item.egg'/336, l='MpServer', x=4024.41, y=95.00, z=2470.56], zy['Creeper'/351, l='MpServer', x=4039.50, y=17.00, z=2470.50], aay['Skeleton'/350, l='MpServer', x=4045.50, y=12.00, z=2471.50], abl['Zombie'/349, l='MpServer', x=4042.56, y=89.00, z=2422.88], xy['Bat'/348, l='MpServer', x=4035.19, y=63.19, z=2389.93], xy['Bat'/347, l='MpServer', x=4033.28, y=61.81, z=2389.69], yk['Sheep'/326, l='MpServer', x=4004.47, y=63.00, z=2487.19], ya['Chicken'/324, l='MpServer', x=4007.63, y=65.00, z=2472.59], zg['item.item.egg'/325, l='MpServer', x=4007.25, y=65.00, z=2472.75], yb['Cow'/322, l='MpServer', x=4015.09, y=63.00, z=2389.03], abl['Zombie'/323, l='MpServer', x=4006.50, y=62.00, z=2399.50], yb['Cow'/321, l='MpServer', x=4013.53, y=54.00, z=2387.84], xy['Bat'/334, l='MpServer', x=4020.25, y=21.47, z=2473.95], ya['Chicken'/335, l='MpServer', x=4024.47, y=93.57, z=2472.10], ya['Chicken'/332, l='MpServer', x=4017.09, y=84.00, z=2457.50], zg['item.item.egg'/333, l='MpServer', x=4017.44, y=83.00, z=2456.81], yb['Cow'/330, l='MpServer', x=4018.84, y=37.00, z=2367.94], ya['Chicken'/331, l='MpServer', x=4026.78, y=87.00, z=2425.59], up['Painting'/289, l='MpServer', x=3973.97, y=79.50, z=2443.50], up['Painting'/290, l='MpServer', x=3973.97, y=79.50, z=2445.00], up['Painting'/291, l='MpServer', x=3973.97, y=80.00, z=2442.50], up['Painting'/263, l='MpServer', x=3966.50, y=79.50, z=2438.97], up['Painting'/264, l='MpServer', x=3966.03, y=79.50, z=2443.50], up['Painting'/265, l='MpServer', x=3966.03, y=80.00, z=2445.50], up['Painting'/262, l='MpServer', x=3962.00, y=79.50, z=2414.03], zy['Creeper'/352, l='MpServer', x=4033.50, y=24.00, z=2479.50], yk['Sheep'/353, l='MpServer', x=4034.66, y=64.00, z=2487.72], zy['Creeper'/842, l='MpServer', x=4007.50, y=56.00, z=2374.50], aay['Skeleton'/844, l='MpServer', x=4004.50, y=56.00, z=2373.50], aay['Skeleton'/845, l='MpServer', x=4003.50, y=56.00, z=2374.50], abg['Spider'/909, l='MpServer', x=3896.50, y=38.00, z=2492.50], xy['Bat'/746, l='MpServer', x=3906.69, y=34.00, z=2366.25], yk['Sheep'/203, l='MpServer', x=3897.22, y=69.00, z=2495.03], yb['Cow'/202, l='MpServer', x=3903.81, y=65.00, z=2355.03], xy['Bat'/743, l='MpServer', x=3901.43, y=34.19, z=2362.75], yk['Sheep'/220, l='MpServer', x=3906.78, y=69.00, z=2474.44], yk['Sheep'/221, l='MpServer', x=3913.53, y=69.00, z=2471.06], yk['Sheep'/222, l='MpServer', x=3915.38, y=70.00, z=2489.25], yk['Sheep'/223, l='MpServer', x=3918.16, y=71.00, z=2488.41], yb['Cow'/216, l='MpServer', x=3904.97, y=66.00, z=2352.59], yb['Cow'/217, l='MpServer', x=3909.97, y=64.00, z=2376.06], yb['Cow'/218, l='MpServer', x=3918.69, y=75.00, z=2375.41], yk['Sheep'/219, l='MpServer', x=3919.41, y=70.00, z=2472.53], yj['Pig'/215, l='MpServer', x=3913.75, y=64.00, z=2365.09], yn['Squid'/239, l='MpServer', x=3933.10, y=61.79, z=2463.71], yn['Squid'/238, l='MpServer', x=3934.70, y=62.10, z=2462.47], zy['Creeper'/237, l='MpServer', x=3927.22, y=69.00, z=2380.66], yb['Cow'/236, l='MpServer', x=3923.28, y=72.00, z=2369.72], yb['Cow'/235, l='MpServer', x=3920.06, y=73.00, z=2367.63], yb['Cow'/234, l='MpServer', x=3923.03, y=64.00, z=2353.13], aay['Skeleton'/233, l='MpServer', x=3929.50, y=63.00, z=2357.50], yb['Cow'/232, l='MpServer', x=3924.34, y=63.00, z=2361.63], yb['Cow'/231, l='MpServer', x=3928.19, y=63.00, z=2362.19], yk['Sheep'/224, l='MpServer', x=3917.84, y=70.00, z=2480.53], yk['Sheep'/250, l='MpServer', x=3942.78, y=64.00, z=2502.66], zy['Creeper'/732, l='MpServer', x=4027.50, y=71.00, z=2379.50], xy['Bat'/249, l='MpServer', x=3940.47, y=45.00, z=2406.44], yk['Sheep'/244, l='MpServer', x=3922.88, y=71.00, z=2488.88], yk['Sheep'/245, l='MpServer', x=3931.94, y=69.00, z=2502.09], yn['Squid'/242, l='MpServer', x=3931.36, y=62.02, z=2467.99], yk['Sheep'/243, l='MpServer', x=3935.31, y=63.00, z=2485.41], yk['Sheep'/240, l='MpServer', x=3934.16, y=62.16, z=2479.88], zy['Creeper'/482, l='MpServer', x=4009.50, y=62.00, z=2393.50], yn['Squid'/241, l='MpServer', x=3933.03, y=61.78, z=2466.55]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at buw.a(SourceFile:308)
	at bjf.b(SourceFile:2069)
	at bjf.f(SourceFile:764)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w18a
	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: 415692616 bytes (396 MB) / 700448768 bytes (668 MB) up to 9544663040 bytes (9102 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx10G
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Launched Version: 14w18a
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 4600 GL version 4.0.0 - Build 9.18.10.3071, Intel
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
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: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: Off (1)