I'm trying to load up the newest Minecraft snapshots, but the game crashes after showing the Mojang logo.

Here is the Crash Report I get:

---- Minecraft Crash Report ----
// My bad.

Time: 12/07/14 14:45
Description: Initializing game

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at ctn.<init>(SourceFile:23)
at cto.a(SourceFile:66)
at ctg.f(SourceFile:369)
at ctg.a(SourceFile:134)
at ctj.a(SourceFile:23)
at crt.a(SourceFile:99)
at bqn.ag(SourceFile:426)
at bqn.a(SourceFile:288)
at net.minecraft.client.main.Main.main(SourceFile:120)

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

– Head –
Stacktrace:
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at ctn.<init>(SourceFile:23)
at cto.a(SourceFile:66)
at ctg.f(SourceFile:369)
at ctg.a(SourceFile:134)
at ctj.a(SourceFile:23)
at crt.a(SourceFile:99)
at bqn.ag(SourceFile:426)

– Initialization –
Details:
Stacktrace:
at bqn.a(SourceFile:288)
at net.minecraft.client.main.Main.main(SourceFile:120)

– System Details –
Details:
Minecraft Version: 14w28b
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 93177320 bytes (88 MB) / 289931264 bytes (276 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 14w28b
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3379, 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.
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: [Faithful]
Current Language: English (UK)
Profiler Position: N/A (disabled)