Help with Coremod

Hi, so I am trying to figure out how to use asm and coremods and I ran into a little problem, please help.

Console Log

2013-05-10 18:05:20 [iNFO] [ForgeModLoader] Forge Mod Loader version 5.2.5.686 for Minecraft 1.5.2 loading
2013-05-10 18:05:20 [iNFO] [ForgeModLoader] Java is Java HotSpot(TM) Client VM, version 1.6.0_43, running on Windows 7:x86:6.1, installed at D:\Program Files\Java\jdk1.6.0_43\jre
2013-05-10 18:05:20 [iNFO] [ForgeModLoader] Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation
2013-05-10 18:05:20 [sEVERE] [ForgeModLoader] Unable to read the coremod jar file FoolsCraft.jar - ignoring
java.util.zip.ZipException: error in opening zip file
   at java.util.zip.ZipFile.open(Native Method)
   at java.util.zip.ZipFile.<init>(ZipFile.java:127)
   at java.util.jar.JarFile.<init>(JarFile.java:136)
   at java.util.jar.JarFile.<init>(JarFile.java:100)
   at cpw.mods.fml.relauncher.RelaunchLibraryManager.discoverCoreMods(RelaunchLibraryManager.java:358)
   at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:136)
   at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
   at cpw.mods.fml.relauncher.FMLRelauncher.relaunchClient(FMLRelauncher.java:104)
   at cpw.mods.fml.relauncher.FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)
   at net.minecraft.client.Minecraft.main(Minecraft.java:2236)
   at Start.main(Start.java:29)

FoolsCraftLoadingPlugin

package m1kep.foolscraft.asm;

import java.util.Map;

import cpw.mods.fml.relauncher.IFMLLoadingPlugin;
import cpw.mods.fml.relauncher.IFMLLoadingPlugin.TransformerExclusions;

@TransformerExclusions({ "m1kep.foolscraft.asm" })
public class FoolsCraftLoadingPlugin implements IFMLLoadingPlugin {

   @Override
   public String[] getLibraryRequestClass() {
      // TODO Auto-generated method stub
      return null;
   }

   @Override
   public String[] getASMTransformerClass() {
      // TODO Auto-generated method stub
      return new String[] { "m1kep.foolscraft.asm.FoolsCraftAccessTransformer" };
   }

   @Override
   public String getModContainerClass() {
      return "m1kep.foolscraft.asm.FoolsCraftModContainer";
   }

   @Override
   public String getSetupClass() {
      // TODO Auto-generated method stub
      return null;
   }

   @Override
   public void injectData(Map<String, Object> data) {
      // TODO Auto-generated method stub

   }

}

FoolsCraftAccessTransformer

package m1kep.foolscraft.asm;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import cpw.mods.fml.common.asm.transformers.AccessTransformer;
import cpw.mods.fml.relauncher.IFMLLoadingPlugin.TransformerExclusions;

public class FoolsCraftAccessTransformer extends AccessTransformer {
   private static FoolsCraftAccessTransformer instance;
   private static List mapFiles = new LinkedList();

   public FoolsCraftAccessTransformer() throws IOException {
      super();
      instance = this;
      // add your access transformers here!
      mapFiles.add("FoolsCraft_at.cfg");
      Iterator it = mapFiles.iterator();
      while (it.hasNext()) {
         String file = (String) it.next();
         this.readMapFile(file);
      }

   }

   public static void addTransformerMap(String mapFileName) {
      if (instance == null) {
         mapFiles.add(mapFileName);
      } else {
         instance.readMapFile(mapFileName);
      }
   }

   private void readMapFile(String name) {
      System.out.println("Adding transformer map: " + name);
      try {
         // get a method from AccessTransformer
         Method e = AccessTransformer.class.getDeclaredMethod("readMapFile",
               new Class[] { String.class });
         e.setAccessible(true);
         // run it with the file given.
         e.invoke(this, new Object[] { name });

      } catch (Exception ex) {
         throw new RuntimeException(ex);
      }
   }

}

FoolsCraftModContainer

package m1kep.foolscraft.asm;

import java.util.Arrays;

import com.google.common.eventbus.Subscribe;

import net.minecraftforge.event.EventBus;
import cpw.mods.fml.common.DummyModContainer;
import cpw.mods.fml.common.LoadController;
import cpw.mods.fml.common.ModMetadata;
import cpw.mods.fml.common.event.FMLServerStartingEvent;

public class FoolsCraftModContainer extends DummyModContainer {

   public FoolsCraftModContainer() {
      super(new ModMetadata());
      ModMetadata myMeta = super.getMetadata();
      myMeta.authorList = Arrays.asList(new String[] { "KeepCalm" });
      myMeta.description = "Only A Fool Would Play";
      myMeta.modId = "FoolsCraft";
      myMeta.version = "1.5.2";
      myMeta.name = "FoolsCraft";
   }

   public boolean registerBus(EventBus bus, LoadController controller) {
      bus.register(this);
      return true;
   }

   @Subscribe
   public void onServerStarting(FMLServerStartingEvent ev) {
      ev.getServer().worldServerForDimension(0).spawnHostileMobs = false;
   }
}

MANIFEST.MF

Manifest-Version: 1.0
FMLCorePlugin: m1kep.foolscraft.asm.FoolsCraftLoadingPlugin

FoolsCraft_at.cfg

public aab/E # spawnHostileMobs

The file directory of my jar is as follows

META-INF
     MANIFEST.MF
asm
     FoolsCraftModContainer.class
     FoolsCraftLoadingPlugin.class
     FoolsCraftAccessTransformer.class
FoolsCraft_at.cfg