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When i load a mod in magic launcher it says no mod found how do i fix this can it be a video plz

Good evening everyone I really hope some one here can help me. Im new to modding but heard magic launcher was the way togo so I worked on this all day and thought I was good to go because I didnt get errors but when I launched well you see. Thanks for advice in advance

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception occured in ModLoader
This error has been saved to C:\Users\PrinceOfTheCity\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-14_19.50.49-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT d99980b7 --------
Generated 11/14/12 7:50 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.7.0_09, Oracle Corporation
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
- Memory: 932113256 bytes (888 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms1024m -Xmx1024m
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- ModLoader: Mods loaded: 1
ModLoader 1.4.2


java.lang.VerifyError: Cannot inherit from final class
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 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:1954)
at ModLoader.addMod(ModLoader.java:373)
at ModLoader.readFromModFolder(ModLoader.java:1370)
at ModLoader.init(ModLoader.java:890)
at ModLoader.addAllRenderers(ModLoader.java:215)
at azw.<init>(RenderManager.java:92)
at azw.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 45a40aa6 ----------

i put it in the default minecraft.jar