diff --git a/fml/common/cpw/mods/fml/common/discovery/DirectoryDiscoverer.java b/fml/common/cpw/mods/fml/common/discovery/DirectoryDiscoverer.java
index c8a8f3999..055786a6e 100644
--- a/fml/common/cpw/mods/fml/common/discovery/DirectoryDiscoverer.java
+++ b/fml/common/cpw/mods/fml/common/discovery/DirectoryDiscoverer.java
@@ -5,12 +5,14 @@ import java.io.FileFilter;
 import java.io.FileInputStream;
 import java.util.Arrays;
 import java.util.List;
+import java.util.logging.Level;
 import java.util.regex.Matcher;
 
 import com.google.common.base.Throwables;
 import com.google.common.collect.Lists;
 
 import cpw.mods.fml.common.FMLLog;
+import cpw.mods.fml.common.LoaderException;
 import cpw.mods.fml.common.MetadataCollection;
 import cpw.mods.fml.common.ModContainer;
 import cpw.mods.fml.common.ModContainerFactory;
@@ -85,6 +87,11 @@ public class DirectoryDiscoverer implements ITypeDiscoverer
                     modParser = new ASMModParser(fis);
                     fis.close();
                 }
+                catch (LoaderException e)
+                {
+                    FMLLog.log(Level.SEVERE, e, "There was a problem reading the file %s - probably this is a corrupt file", file.getPath());
+                    throw e;
+                }
                 catch (Exception e)
                 {
                     Throwables.propagate(e);
diff --git a/fml/common/cpw/mods/fml/common/discovery/JarDiscoverer.java b/fml/common/cpw/mods/fml/common/discovery/JarDiscoverer.java
index a8bcd7cd6..7d021fc83 100644
--- a/fml/common/cpw/mods/fml/common/discovery/JarDiscoverer.java
+++ b/fml/common/cpw/mods/fml/common/discovery/JarDiscoverer.java
@@ -10,6 +10,7 @@ import java.util.zip.ZipFile;
 import com.google.common.collect.Lists;
 
 import cpw.mods.fml.common.FMLLog;
+import cpw.mods.fml.common.LoaderException;
 import cpw.mods.fml.common.MetadataCollection;
 import cpw.mods.fml.common.ModContainer;
 import cpw.mods.fml.common.ModContainerFactory;
@@ -44,7 +45,16 @@ public class JarDiscoverer implements ITypeDiscoverer
                 Matcher match = classFile.matcher(ze.getName());
                 if (match.matches())
                 {
-                    ASMModParser modParser = new ASMModParser(jar.getInputStream(ze));
+                    ASMModParser modParser;
+                    try
+                    {
+                        modParser = new ASMModParser(jar.getInputStream(ze));
+                    }
+                    catch (LoaderException e)
+                    {
+                        FMLLog.log(Level.SEVERE, e, "There was a problem reading the entry %s in the jar %s - probably a corrupt zip", ze.getName(), candidate.getModContainer().getPath());
+                        throw e;
+                    }
                     modParser.validate();
                     modParser.sendToTable(table, candidate);
                     ModContainer container = ModContainerFactory.instance().build(modParser, candidate.getModContainer(), candidate);
diff --git a/fml/common/cpw/mods/fml/common/discovery/asm/ASMModParser.java b/fml/common/cpw/mods/fml/common/discovery/asm/ASMModParser.java
index 02058276a..03254c3f3 100644
--- a/fml/common/cpw/mods/fml/common/discovery/asm/ASMModParser.java
+++ b/fml/common/cpw/mods/fml/common/discovery/asm/ASMModParser.java
@@ -3,6 +3,7 @@ package cpw.mods.fml.common.discovery.asm;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.LinkedList;
+import java.util.logging.Level;
 
 import net.minecraft.src.BaseMod;
 
@@ -12,6 +13,8 @@ import org.objectweb.asm.Type;
 import com.google.common.base.Objects;
 import com.google.common.collect.Lists;
 
+import cpw.mods.fml.common.FMLLog;
+import cpw.mods.fml.common.LoaderException;
 import cpw.mods.fml.common.discovery.ASMDataTable;
 import cpw.mods.fml.common.discovery.ModCandidate;
 
@@ -31,8 +34,16 @@ public class ASMModParser
 
     public ASMModParser(InputStream stream) throws IOException
     {
-        ClassReader reader = new ClassReader(stream);
-        reader.accept(new ModClassVisitor(this), 0);
+        try
+        {
+            ClassReader reader = new ClassReader(stream);
+            reader.accept(new ModClassVisitor(this), 0);
+        }
+        catch (Exception ex)
+        {
+            FMLLog.log(Level.SEVERE, ex, "Unable to read a class file correctly");
+            throw new LoaderException(ex);
+        }
     }
 
     public void beginNewTypeName(String typeQName, int classVersion, String superClassQName)
@@ -132,13 +143,13 @@ public class ASMModParser
     public void addAnnotationEnumProperty(String name, String desc, String value)
     {
         annotations.getFirst().addEnumProperty(name, desc, value);
-        
+
     }
 
     public void endArray()
     {
         annotations.getFirst().endArray();
-        
+
     }
 
     public void addSubAnnotation(String name, String desc)