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I follow all the directions and I keep coming up with this error

---- Minecraft Crash Report ----
Time: 2/3/13 1:04 AM
Description: Exception occured in ModLoader
java.lang.VerifyError: (class: mod_magiz, method: addRenderer signature: (Ljava/util/Map;)V) Incompatible argument to function
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:1968)
at ModLoader.addMod(ModLoader.java:370)
at ModLoader.readFromClassPath(ModLoader.java:1285)
at ModLoader.init(ModLoader.java:908)
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)

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: 1.4.7
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Oracle Corporation
Memory: 6244776 bytes (5 MB) / 40251392 bytes (38 MB) up to 259522560 bytes (247 MB)
JVM Flags: 0 total;
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: ModLoader, ModTextureStatic, EntityRendererProxy, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
ModLoader: Mods loaded: 1
ModLoader 1.4.7