Yeah, I am having a very similar issue.
I am using the latest recomended CB for 1.0.1, or, the only one for that matter. CB build #1597.
My mod loader.txt says
Spoiler
Dec 19, 2011 4:56:58 PM net.minecraft.server.ModLoader init
FINE: ModLoader Server 1.0.0 Initializing...
Dec 19, 2011 4:56:58 PM net.minecraft.server.ModLoader readFromClassPath
FINER: Adding mods from C:\Users\Rojikku\Desktop\test\craftbukkit.jar
Dec 19, 2011 4:56:58 PM net.minecraft.server.ModLoader readFromClassPath
FINER: Zip found.
Dec 19, 2011 4:56:59 PM net.minecraft.server.ModLoader addMod
FINE: Failed to load mod from "mod_IC2.class"
Dec 19, 2011 4:56:59 PM ModLoader addMod
FINER: THROW
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at net.minecraft.server.mod_IC2.setValuableOreFromString(mod_IC2.java:2060)
at net.minecraft.server.mod_IC2.initialize(mod_IC2.java:367)
at ic2.platform.Ic2.<init>(Ic2.java:20)
at net.minecraft.server.mod_IC2.<init>(mod_IC2.java:22)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:160)
at net.minecraft.server.ModLoader.readFromClassPath(ModLoader.java:795)
at net.minecraft.server.ModLoader.init(ModLoader.java:554)
at net.minecraft.server.ModLoader.Init(ModLoader.java:1080)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:100)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:402)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
Dec 19, 2011 4:56:59 PM net.minecraft.server.ModLoader ThrowException
SEVERE: Unexpected exception
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at net.minecraft.server.mod_IC2.setValuableOreFromString(mod_IC2.java:2060)
at net.minecraft.server.mod_IC2.initialize(mod_IC2.java:367)
at ic2.platform.Ic2.<init>(Ic2.java:20)
at net.minecraft.server.mod_IC2.<init>(mod_IC2.java:22)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:160)
at net.minecraft.server.ModLoader.readFromClassPath(ModLoader.java:795)
at net.minecraft.server.ModLoader.init(ModLoader.java:554)
at net.minecraft.server.ModLoader.Init(ModLoader.java:1080)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:100)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:402)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
Dec 19, 2011 4:56:59 PM ModLoader init
FINER: THROW
java.lang.RuntimeException: Exception occured in ModLoader
at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1031)
at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1035)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:171)
at net.minecraft.server.ModLoader.readFromClassPath(ModLoader.java:795)
at net.minecraft.server.ModLoader.init(ModLoader.java:554)
at net.minecraft.server.ModLoader.Init(ModLoader.java:1080)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:100)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:402)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at net.minecraft.server.mod_IC2.setValuableOreFromString(mod_IC2.java:2060)
at net.minecraft.server.mod_IC2.initialize(mod_IC2.java:367)
at ic2.platform.Ic2.<init>(Ic2.java:20)
at net.minecraft.server.mod_IC2.<init>(mod_IC2.java:22)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:160)
... 6 more
Dec 19, 2011 4:56:59 PM net.minecraft.server.ModLoader ThrowException
SEVERE: Unexpected exception
java.lang.RuntimeException: Exception occured in ModLoader
at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1031)
at net.minecraft.server.ModLoader.ThrowException(ModLoader.java:1035)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:171)
at net.minecraft.server.ModLoader.readFromClassPath(ModLoader.java:795)
at net.minecraft.server.ModLoader.init(ModLoader.java:554)
at net.minecraft.server.ModLoader.Init(ModLoader.java:1080)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:100)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:402)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at net.minecraft.server.mod_IC2.setValuableOreFromString(mod_IC2.java:2060)
at net.minecraft.server.mod_IC2.initialize(mod_IC2.java:367)
at ic2.platform.Ic2.<init>(Ic2.java:20)
at net.minecraft.server.mod_IC2.<init>(mod_IC2.java:22)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at net.minecraft.server.ModLoader.addMod(ModLoader.java:160)
... 6 more
I do how spoiler tags work or you just got spammed. ANYWAY, that's my issue..Uhm. I coped MLMP and MCF, then IC2...I check manually, there is a mod_IC2.class file in /net/minecraft...
I just am posting this here because I didn't want to spam 500 pages for what is PROBABLY the same issue, hope that isn't a problem.
xD It would be really awesome if we could get this working.
Additional Info: I have no plugins, downloaded a fresh CB file, modded it, started it from CMD with java -jar craftbukkit.jar... not much else I know I can do.