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Can anyone help guide me to fix the crash i recently experienced with minecraft?

Details of the crash are below:

---- Minecraft Crash Report ----
// There are four lights!

Time: 09/01/14 5:02 PM
Description: Rendering screen

java.lang.NullPointerException
at net.minecraft.client.gui.inventory.GuiContainer.func_85044_b(GuiContainer.java:207)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:186)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1021)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:870)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at net.minecraft.client.gui.inventory.GuiContainer.func_85044_b(GuiContainer.java:207)
at net.minecraft.client.gui.inventory.GuiContainer.func_73863_a(GuiContainer.java:186)

-- Screen render details --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiFurnace
Mouse location: Scaled: (256, 128). Absolute: (1027, 503)
Screen size: Scaled: (480, 255). Absolute: (1920, 1017). Scale factor of 4

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['innerthread418'/232, l='MpServer', x=230.30, y=46.62, z=181.30]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (216,64,172), Chunk: (at 8,4,12 in 13,10; contains blocks 208,0,160 to 223,255,175), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 87469 game time, 87469 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: 28 total; [EntityFakeItem['item.item.swordDiamond'/747, l='MpServer', x=230.50, y=46.13, z=179.50], EntitySheep['Sheep'/137, l='MpServer', x=168.19, y=63.00, z=249.78], EntityBat['Bat'/3164, l='MpServer', x=286.58, y=23.60, z=220.71], EntitySheep['Sheep'/136, l='MpServer', x=165.66, y=63.00, z=255.84], EntitySquid['Squid'/1305, l='MpServer', x=296.50, y=58.00, z=201.31], EntitySquid['Squid'/1304, l='MpServer', x=292.41, y=59.28, z=207.38], EntitySheep['Sheep'/138, l='MpServer', x=165.53, y=68.00, z=248.19], EntityBat['Bat'/2610, l='MpServer', x=304.59, y=14.00, z=171.38], EntitySquid['Squid'/1303, l='MpServer', x=295.09, y=57.25, z=205.50], EntitySheep['Sheep'/133, l='MpServer', x=170.38, y=67.00, z=172.22], EntityBat['Bat'/192, l='MpServer', x=274.94, y=15.10, z=166.50], EntitySheep['Sheep'/132, l='MpServer', x=168.50, y=68.00, z=169.78], EntitySheep['Sheep'/135, l='MpServer', x=173.47, y=69.00, z=163.13], EntityBat['Bat'/2616, l='MpServer', x=268.22, y=24.00, z=244.16], EntitySheep['Sheep'/134, l='MpServer', x=168.50, y=69.00, z=168.19], EntitySheep['Sheep'/156, l='MpServer', x=219.84, y=77.00, z=151.06], EntitySheep['Sheep'/157, l='MpServer', x=208.50, y=77.00, z=147.66], EntitySheep['Sheep'/146, l='MpServer', x=193.44, y=73.00, z=155.16], EntitySheep['Sheep'/147, l='MpServer', x=200.34, y=78.00, z=152.25], EntitySheep['Sheep'/175, l='MpServer', x=257.13, y=67.00, z=140.94], EntitySheep['Sheep'/174, l='MpServer', x=258.44, y=66.00, z=137.28], EntityClientPlayerMP['innerthread418'/232, l='MpServer', x=230.30, y=46.62, z=181.30], EntitySheep['Sheep'/173, l='MpServer', x=265.06, y=65.00, z=131.06], EntitySheep['Sheep'/161, l='MpServer', x=233.84, y=71.00, z=106.78], EntitySheep['Sheep'/117, l='MpServer', x=159.22, y=63.00, z=243.81], EntitySheep['Sheep'/176, l='MpServer', x=264.84, y=65.00, z=144.25], EntitySquid['Squid'/1316, l='MpServer', x=285.22, y=57.34, z=192.50], EntitySquid['Squid'/1318, l='MpServer', x=277.53, y=56.25, z=197.78]]
Retry entities: 0 total; []
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2413)
at net.minecraft.client.Minecraft.run(Minecraft.java:775)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 332822464 bytes (317 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 2523 (141288 bytes; 0 MB) allocated, 461 (25816 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.44 FML v5.1.43.682 Minecraft Forge 7.7.2.682 5 mods loaded, 5 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.1.43.682} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.7.2.682} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Aether II{Alpha v1.0.1} [Aether II] (AetherII_Alpha_v1.0.2_MC1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MainMenuAPI{1.0.0} [Main Menu API] (AetherII_Alpha_v1.0.2_MC1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: GeForce 9100/PCI/SSE2 GL version 3.0.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2123 (118888 bytes; 0 MB) allocated, 348 (19488 bytes; 0 MB) used

Let me sum it up for you.
Your screen and minecraft are like (bad+bad)=Let me sum it up for you.
Your screen and minecraft are like (bad+bad)=

Sorry, what does this mean? Can it be fixed?