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Every time I try to log onto my server, any other server, or even a singleplayer world, my minecraft gives me a grey screen then crashes. This started when I accidentally dragged out the arw.class from the minecraft.jar while logged onto my server. I've deleted my minecraft folder, my .jar separately, restarted my computer, redownloaded the minecraft application, and even updated java. NOTHING WORKS! I've nearly finished a server and its about to go public in a few days, but I can't play minecraft at all . D: HELP!
---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 1/28/13 6:56 PM
Description: Unexpected error

java.lang.NoClassDefFoundError: arx
at arw.<clinit>(RenderHelper.java:12)
at bav.a(SourceFile:689)
at ban.a(SourceFile:852)
at ban.b(SourceFile:751)
at net.minecraft.client.Minecraft.J(SourceFile:605)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: arx
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 7 more


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

-- Head --
Stacktrace:
at arw.<clinit>(RenderHelper.java:12)
at bav.a(SourceFile:689)
at ban.a(SourceFile:852)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [ays['Emoule_Skyder'/377309, l='MpServer', x=316.33, y=40.12, z=477.73]]
Chunk stats: MultiplayerChunkCache: 5
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (246,38,464), Chunk: (at 6,2,0 in 15,29; contains blocks 240,0,464 to 255,255,479), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 52558857 game time, 23713468 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: 38 total; [mc['entity.ItemFrame.name'/275, l='MpServer', x=311.50, y=41.50, z=474.06], ays['Emoule_Skyder'/377309, l='MpServer', x=316.33, y=40.12, z=477.73], mc['entity.ItemFrame.name'/274, l='MpServer', x=309.50, y=41.50, z=474.06], mc['entity.ItemFrame.name'/273, l='MpServer', x=307.50, y=41.50, z=474.06], mc['entity.ItemFrame.name'/272, l='MpServer', x=305.50, y=41.50, z=474.06], mc['entity.ItemFrame.name'/279, l='MpServer', x=313.50, y=41.50, z=478.94], mc['entity.ItemFrame.name'/278, l='MpServer', x=316.50, y=41.50, z=478.94], mc['entity.ItemFrame.name'/277, l='MpServer', x=317.06, y=41.50, z=470.50], mc['entity.ItemFrame.name'/276, l='MpServer', x=313.50, y=41.50, z=474.06], mc['entity.ItemFrame.name'/283, l='MpServer', x=313.50, y=40.50, z=481.06], mc['entity.ItemFrame.name'/282, l='MpServer', x=312.94, y=39.50, z=493.50], mc['entity.ItemFrame.name'/281, l='MpServer', x=312.94, y=39.50, z=495.50], mc['entity.ItemFrame.name'/280, l='MpServer', x=312.94, y=39.50, z=491.50], mc['entity.ItemFrame.name'/287, l='MpServer', x=315.50, y=40.50, z=486.94], mc['entity.ItemFrame.name'/286, l='MpServer', x=317.94, y=40.50, z=485.50], mg['Painting'/315, l='MpServer', x=324.06, y=39.50, z=473.00], mc['entity.ItemFrame.name'/285, l='MpServer', x=317.94, y=40.50, z=482.50], mc['entity.ItemFrame.name'/284, l='MpServer', x=315.50, y=40.50, z=481.06], mc['entity.ItemFrame.name'/320, l='MpServer', x=321.94, y=41.50, z=473.50], mc['entity.ItemFrame.name'/270, l='MpServer', x=317.06, y=41.50, z=465.50], mc['entity.ItemFrame.name'/271, l='MpServer', x=318.50, y=41.50, z=468.06], mc['entity.ItemFrame.name'/268, l='MpServer', x=315.94, y=41.50, z=465.50], mc['entity.ItemFrame.name'/269, l='MpServer', x=318.50, y=41.50, z=466.94], mc['entity.ItemFrame.name'/236, l='MpServer', x=303.06, y=39.50, z=493.50], mc['entity.ItemFrame.name'/235, l='MpServer', x=303.06, y=39.50, z=495.50], mc['entity.ItemFrame.name'/234, l='MpServer', x=303.06, y=39.50, z=491.50], mc['entity.ItemFrame.name'/233, l='MpServer', x=299.06, y=39.50, z=482.50], mc['entity.ItemFrame.name'/232, l='MpServer', x=299.06, y=39.50, z=485.50], mc['entity.ItemFrame.name'/231, l='MpServer', x=303.50, y=39.50, z=481.06], mc['entity.ItemFrame.name'/230, l='MpServer', x=301.50, y=39.50, z=481.06], mc['entity.ItemFrame.name'/229, l='MpServer', x=301.50, y=39.50, z=486.94], mg['Painting'/315, l='MpServer', x=324.06, y=39.50, z=473.00], mc['entity.ItemFrame.name'/228, l='MpServer', x=303.50, y=39.50, z=486.94], mc['entity.ItemFrame.name'/317, l='MpServer', x=320.50, y=41.50, z=468.06], mc['entity.ItemFrame.name'/316, l='MpServer', x=320.50, y=41.50, z=466.94], mc['entity.ItemFrame.name'/319, l='MpServer', x=321.94, y=41.50, z=471.50], mc['entity.ItemFrame.name'/318, l='MpServer', x=321.94, y=40.50, z=469.50], mc['entity.ItemFrame.name'/288, l='MpServer', x=313.50, y=40.50, z=486.94]]
Retry entities: 0 total; []
Stacktrace:
at ayp.a(SourceFile:281)
at net.minecraft.client.Minecraft.b(SourceFile:1871)
at net.minecraft.client.Minecraft.run(SourceFile:548)
at java.lang.Thread.run(Thread.java:680)

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_37, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 541369944 bytes (516 MB) / 581435392 bytes (554 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 11041 (618296 bytes; 0 MB) allocated, 11041 (618296 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel HD Graphics 4000 OpenGL Engine GL version 2.1 APPLE-7.32.12, Intel 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: 24 (1344 bytes; 0 MB) allocated, 24 (1344 bytes; 0 MB) used