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

Minecraft has stopped running because it encountered a problem.




--- BEGIN ERROR REPORT 96b19b66 --------
Generated 4/30/12 6:34 PM

Minecraft: Minecraft 1.2.5
OS: Windows 7 (amd64) version 6.1
Java: 1.7.0_03, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: GeForce GT 520/PCI/SSE2 version 4.1.0, NVIDIA Corporation

java.lang.NoClassDefFoundError: LCustomSpawner;
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:1763)
at ModLoader.addMod(ModLoader.java:293)
at ModLoader.readFromModFolder(ModLoader.java:1276)
at ModLoader.init(ModLoader.java:887)
at ModLoader.addAllRenderers(ModLoader.java:189)
at ahu.<init>(ahu.java:77)
at ahu.<clinit>(ahu.java:8)
at net.minecraft.client.Minecraft.a(SourceFile:273)
at net.minecraft.client.Minecraft.run(SourceFile:657)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: CustomSpawner
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)
... 13 more
--- END ERROR REPORT 29b6b89b ----------

WHAT DO I NEED!!!!