SackCastellon

I'm trying to create a config file, i've written this: Main class package SackCastellon.craftablehorsearmor.common; import java.util.Iterator; import java.util.List; import SackCastellon.craftablehorsearmor.common.core.*; import SackCastellon.craftablehorsearmor.common.item.*; import SackCastellon.craftablehorsearmor.common.tabs.*; import SackCastellon.craftablehorsearmor.lib.*; import net.minecraft.block.Block; import net.minecraft.block.material.Material; import net.minecraft.creativetab.CreativeTabs; import net.minecraft.item.*; import net.minecraft.item.Item; import cpw.mods.fml.common.Mod; import cpw.mods.fml.common.Mod.*; import cpw.mods.fml.common.SidedProxy; import cpw.mods.fml.common.event.*; import cpw.mods.fml.common.network.*; import cpw.mods.fml.common.registry.*; @Mod(modid="SKC-CraftableHorseArmor", name="Craftable Horse Armor", version="1.0.2.1") @NetworkMod(clientSideRequired=true, serverSideRequired=false) public class CraftableHorseArmor { public static String texturePath = "craftablehorsearmor:"; @Instance("CraftableHorseArmor") public static CraftableHorseArmor instance; public static final CreativeTabs tabCraftableHorseArmor = new CreativeTabCraftableHorseArmor(CreativeTabs.getNextID(), "CraftableHorseArmor"); public static Item Knot = new ItemKnot(ConfigHandler.KnotID); @SidedProxy(clientSide="SackCastellon.craftablehorsearmor.client.core.ClientProxy", serverSide="SackCastellon.craftablehorsearmor.common.core.CommonProxy") public static CommonProxy proxy; @EventHandler public void preInit(FMLPreInitializationEvent event) { ConfigHandler.init(event); } @EventHandler public void load(FMLInitializationEvent event) { proxy.registerRenderers(); LanguageRegistry.addName(Knot, Names.Item_Knot_name); } @EventHandler public void postInit(FMLPostInitializationEvent event) { } } ConfigHandler class package SackCastellon.craftablehorsearmor.lib; import java.io.File; import cpw.mods.fml.common.event.FMLPreInitializationEvent; import SackCastellon.craftablehorsearmor.common.item.ItemKnot; import net.minecraftforge.common.Configuration; import net.minecraftforge.common.Property; public class ConfigHandler { public static int KnotID; public static Configuration config; public static void init(FMLPreInitializationEvent event) { config = new Configuration(event.getSuggestedConfigurationFile()); config.load(); KnotID = config.getItem("Knot ID", 10001).getInt(); config.save(); } } But when i run minecraft (on eclipse) the console shows this: 2013-07-31 10:57:24 [iNFO] [sTDOUT] CONFLICT @ 0 item slot already occupied by net.minecraft.item.ItemSpade@2afda72a while adding SackCastellon.craftablehorsearmor.common.item.ItemKnot@72e9cc72 2013-07-31 10:57:24 [iNFO] [fml.ItemTracker] The mod SKC-CraftableHorseArmor is overwriting existing item at 256 (net.minecraft.item.ItemSpade from Minecraft) with SackCastellon.craftablehorsearmor.common.item.ItemKnot And the item has the ID #256 which corresponds to the iron shovel as you can see here:

Is there any way to modify vanilla classes without modifying them I mean if there's any way to make able a horse to be rided by a new saddle?

I've followed this guide http://www.minecraftforge.net/wiki/How_to_make_an_advanced_configuration_file but it doesn't work Edit: When i do all that say the guide and i run Minecraft, only is showed one item of the three i created and this one don't have the ID that i assigned to him this item has the ID #256 which corresponds to the iron shovel. Can you tell me why it doesn't work? Or how can i make it work?