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hey guys trying to run dragonmount mod (1.4.6) and when i finish putting everything into minecraft jar file and i try to lauch minecraft and it saids is crashes

FINE: ModLoader 1.4.6 Initializing...
Jan 05, 2013 2:00:42 PM ModLoader readFromClassPath
FINER: Adding mods from C:\Users\jake\AppData\Roaming\.minecraft\bin\minecraft.jar
Jan 05, 2013 2:00:42 PM ModLoader readFromClassPath
FINER: Zip found.
Jan 05, 2013 2:00:43 PM ModLoader addMod
FINE: Failed to load mod from "mod_DragonMounts.class"
Jan 05, 2013 2:00:43 PM ModLoader addMod
FINER: THROW
java.lang.NoClassDefFoundError: info/ata4/minecraft/dragon/DragonsMod
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 ModLoader.addMod(ModLoader.java:366)
at ModLoader.readFromClassPath(ModLoader.java:1287)
at ModLoader.init(ModLoader.java:910)
at ModLoader.addAllRenderers(ModLoader.java:215)
at bbu.<init>(RenderManager.java:94)
at bbu.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: info.ata4.minecraft.dragon.DragonsMod
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)
... 21 more
Jan 05, 2013 2:00:53 PM ModLoader addAllRenderers
FINE: Initialized


Please help, jake