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im getting this error when starting up Minecraft PLEASE HELP!

---- Minecraft Crash Report ----
// Oops.

Time: 4/30/14 3:54 PM
Description: Generating mipmaps for frame

java.lang.ArrayIndexOutOfBoundsException: 4
at brb.a(SourceFile:82)
at bqw.d(SourceFile:247)
at bqs.b(SourceFile:165)
at bqs.a(SourceFile:90)
at bqy.a(SourceFile:72)
at bqy.a(SourceFile:61)
at bqy.a(SourceFile:52)
at azi.ad(SourceFile:422)
at azi.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:152)


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

-- Head --
Stacktrace:
at brb.a(SourceFile:82)

-- Frame being iterated --
Details:
Frame index: 0
Frame sizes: 4, null, null, null, null
Stacktrace:
at bqw.d(SourceFile:247)

-- Sprite being mipmapped --
Details:
Sprite name: piston_inner
Sprite size: 2 x 2
Sprite frames: 1 frames
Mipmap levels: 1
Stacktrace:
at bqs.b(SourceFile:165)
at bqs.a(SourceFile:90)

-- Resource location being registered --
Details:
Resource location: minecraft:textures/atlas/blocks.png
Texture object class: bqs
Stacktrace:
at bqy.a(SourceFile:72)
at bqy.a(SourceFile:61)
at bqy.a(SourceFile:52)
at azi.ad(SourceFile:422)

-- Initialization --
Details:
Stacktrace:
at azi.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:152)

-- System Details --
Details:
Minecraft Version: 1.7.4
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), Oracle Corporation
Memory: 31550064 bytes (30 MB) / 70569984 bytes (67 MB) up to 1037959168 bytes (989 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: 1.7.4
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 6320 Graphics GL version 4.1.10825 Compatibility Profile Context, ATI Technologies Inc.
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: [Simple Vanilla 2x2.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
Anisotropic Filtering: Off (1)

Disable mipmapping. This option is usually found in the options menu under video settings, but since you can't start minecraft, you'll have to edit the config file instead. Go to your .minecraft folder, and open "options.txt". Then find "mipmapLevels", and set it to 0.