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Wierd problem with mods... I am using mod installers for mods like paintball and crossbow... and they all worked before, but now, I install them and start a new world and it stays at the place where it says "Building terrain" for a long time, and then crashes and gives me this report with all the mods I try!!! Here it is:
---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 10/20/12 9:38 AM
Description: Unexpected error

java.lang.NoClassDefFoundError: aux
at avf.a(RenderEngine.java:428)
at avb.a(RenderGlobal.java:1987)
at up.a(World.java:1354)
at atd.a(SourceFile:128)
at up.d(World.java:1339)
at atd.d(SourceFile:110)
at net.minecraft.client.Minecraft.a(Minecraft.java:1959)
at net.minecraft.client.Minecraft.a(Minecraft.java:1885)
at asv.a(NetClientHandler.java:164)
at cs.a(SourceFile:71)
at ba.b(MemoryConnection.java:75)
at net.minecraft.client.Minecraft.l(Minecraft.java:1797)
at net.minecraft.client.Minecraft.J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:764)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: aux
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:100)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 15 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 6
at org.objectweb.asm.ClassReader.readShort(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:27)
at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:142)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:93)
... 17 more

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_07, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 298243456 bytes (284 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- FML: FML v3.0.171.348 Minecraft Forge 4.0.0.243 3 mods loaded, 3 mods active
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Paintball [Paintball] (Paintball.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
- LWJGL: 2.4.2
- OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2509, Intel
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- World MpServer Entities: 1 total; [atg['Justus'/320, l='MpServer', x=8.50, y=66.62, z=8.50]]
- World MpServer Players: 1 total; [atg['Justus'/320, l='MpServer', x=8.50, y=66.62, z=8.50]]
- World MpServer Chunk Stats: MultiplayerChunkCache: 0
- Forced Entities: 0 total; []
- Retry Entities: 0 total; []
Please Help!!!!!!!!!!