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when i tried to mod 1.5

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 17/03/13 10:01 AM
Description: Exception occured in ModLoader

java.lang.NoClassDefFoundError: forge/NetworkMod
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:336)
at ModLoader.readFromModFolder(ModLoader.java:1202)
at ModLoader.init(ModLoader.java:737)
at ModLoader.addAllRenderers(ModLoader.java:205)
at bgs.<init>(RenderManager.java:97)
at bgs.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at avp.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:505)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: forge.NetworkMod
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


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 445503312 bytes (424 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: ModLoader, EntityRendererProxy, BaseMod, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
ModLoader: Mods loaded: 1
ModLoader 1.5