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i have mod loader downloaded for a while and randomly it started crashing this is the crash report please help



---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 10/9/12 11:03 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: yw
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at vk.<clinit>(SourceFile:20)
at vp.<init>(SourceFile:20)
at vp.<init>(SourceFile:30)
at vp.<init>(SourceFile:38)
at xc.b(SourceFile:40)
at xc.a(SourceFile:24)
at up.<init>(SourceFile:148)
at gr.<init>(SourceFile:65)
at axv.a(SourceFile:65)
at axv.b(SourceFile:94)
at net.minecraft.server.MinecraftServer.run(SourceFile:291)
at ep.run(SourceFile:539)
Caused by: java.lang.ClassNotFoundException: yw
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 23 more

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_05, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 467910944 bytes (446 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- Is Modded: Very likely
- Profiler Position: N/A (disabled)
- Player Count: 0 / 8; []
- Type: Integrated Server