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i cannot start minecraft it says

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

Time: 12-09-12 16:31
Description: Exception occured in ModLoader

java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
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$000(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 java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at ModLoader.setupProperties(ModLoader.java:2064)
at ModLoader.addMod(ModLoader.java:342)
at ModLoader.readFromModFolder(ModLoader.java:1429)
at ModLoader.init(ModLoader.java:932)
at ModLoader.addAllRenderers(ModLoader.java:185)
at avy.<init>(RenderManager.java:87)
at avy.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:260)
at net.minecraft.client.Minecraft.run(SourceFile:516)
at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.3.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_26, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 936096480 bytes (892 MB) / 1029046272 bytes (981 MB) up to 1029046272 bytes (981 MB)
- JVM Flags: 2 total; -Xms1024m -Xmx1024m
- ModLoader: Mods loaded: 3
ModLoader 1.3.2
mod_drop 1.3.2
mod_flowercraft 1.3.2

Its a crash-report from my .minercraft

I'm no coder (yet), but get a clean jar. You might have a two .class files from the same mod with the same mod interfering with eachother.
Once again, I have no knowledge of Java but if all else fails just get a clean .jar

I would suggest wiping it and starting with a clean minecraft (you can backup saves if you like because those are not what is causing it...) and if you are using Magic Launcher and it is not giving you an error before you start it up (it should show conflicts right away in the set up menu) than re-download the launcher.

Idk if this will help but back when I used magic I had some issues and ended up installing ML and Forge manually to my .minecraft than getting the other mods with magic. which fixed my problems (not sure why it did but it did) .