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When I tried to install the Pixelmon mod for Minecraft v.1.5.2 with the new launcher, I opened Minecraft and it crashed. Minecraft Forge loaded fine, but after that, the screen froze on the Mojang logo and then crashed. Any help?

---- Minecraft Crash Report ----
// Why is it breaking : (

Time: 7/21/13 4:55 PM
Description: Unexpected error

java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at net.minecraft.client.audio.SoundPool.addSound(SoundPool.java:89)
at net.minecraft.client.audio.SoundPool.func_77459_a(SoundPool.java:42)
at net.minecraft.client.audio.SoundManager.func_77365_c(SoundManager.java:173)
at pixelmon.sounds.Sounds.installMusic(Sounds.java:35)
at pixelmon.TickHandler.tickStart(TickHandler.java:48)
at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:28)
at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:122)
at cpw.mods.fml.common.FMLCommonHandler.onRenderTickStart(FMLCommonHandler.java:372)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:869)
at net.minecraft.client.Minecraft.run(Minecraft.java:760)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.charAt(String.java:686)
at net.minecraft.client.audio.SoundPool.addSound(SoundPool.java:67)
... 10 more


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.8.3
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 27513520 bytes (26 MB) / 102096896 bytes (97 MB) up to 1069416448 bytes (1019 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.51 FML v5.2.21.729 Minecraft Forge 7.8.0.729 4 mods loaded, 4 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{5.2.21.729} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{7.8.0.729} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Pixelmon{2.2} [Pixelmon] (Pixelmon 2.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.9.0
OpenGL: NVIDIA GeForce 9400 OpenGL Engine GL version 2.1 NVIDIA-8.10.44 304.10.65f03, 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: ~~ERROR~~ NullPointerException: null