Aide pour Modding Minecraft Bug urgent svp

Bonjour, voila j'ai cree un petit mod sur Mincraft a l'aide d'Eclipse, mais quand je demarre il y a un rapport de crash a cause que je ne peux pas faire un craft et donc ca crache.
Merci de m'aider n'importe comment. Vous pouvez tester pour voir quel est le bug, Merci beaucoup.

VOICI LE RAPPORT DE CRASH :

Mods loaded: 2
ModLoader 1.2.5
mod_Emeraude 1.0 for Minecraft 1.2.5

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

Minecraft has stopped running because it encountered a problem.

--- BEGIN ERROR REPORT c47e0f3f --------
Generated 03.07.2012 03:39

Minecraft: Minecraft 1.2.5
OS: Windows 7 (amd64) version 6.1
Java: 1.7.0_02, Oracle Corporation
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
LWJGL: 2.4.2
OpenGL: ATI Mobility Radeon HD 5650 version 3.2.9712 Compatibility Profile Context, ATI Technologies Inc.

java.lang.NullPointerException
at net.minecraft.src.ItemStack.<init>(ItemStack.java:48)
at net.minecraft.src.mod_Rubis.<init>(mod_Rubis.java:17)
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.src.ModLoader.addMod(ModLoader.java:287)
at net.minecraft.src.ModLoader.readFromClassPath(ModLoader.java:1274)
at net.minecraft.src.ModLoader.init(ModLoader.java:844)
at net.minecraft.src.ModLoader.addAllRenderers(ModLoader.java:157)
at net.minecraft.src.RenderManager.<init>(RenderManager.java:85)
at net.minecraft.src.RenderManager.<clinit>(RenderManager.java:12)
at net.minecraft.client.Minecraft.startGame(Minecraft.java:424)
at net.minecraft.client.Minecraft.run(Minecraft.java:786)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 484202da ----------