I made a new armor set but when i put it on, it works, but it doesnt display on player model and myconsole is flooded with this error:

2013-02-05 17:54:38 [iNFO] [sTDERR] java.lang.ArrayIndexOutOfBoundsException: 20
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderPlayer.setArmorModel(RenderPlayer.java:63)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderPlayer.shouldRenderPass(RenderPlayer.java:532)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderLiving.doRenderLiving(RenderLiving.java:127)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderPlayer.renderPlayer(RenderPlayer.java:168)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderPlayer.doRender(RenderPlayer.java:566)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.entity.RenderManager.renderEntityWithPosYaw(RenderManager.java:302)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.gui.inventory.GuiInventory.drawPlayerOnGui(GuiInventory.java:119)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawGuiContainerBackgroundLayer(GuiContainerCreative.java:704)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.gui.inventory.GuiContainer.drawScreen(GuiContainer.java:88)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.InventoryEffectRenderer.drawScreen(InventoryEffectRenderer.java:43)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.gui.inventory.GuiContainerCreative.drawScreen(GuiContainerCreative.java:591)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1004)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:882)
2013-02-05 17:54:38 [iNFO] [sTDERR] 	at net.minecraft.client.Minecraft.run(Minecraft.java:771)

My code:

MOreArmor:

package net.minecraft.mOre;

import net.minecraft.item.EnumArmorMaterial;
import net.minecraft.item.ItemArmor;
import net.minecraft.item.ItemStack;
import net.minecraftforge.common.IArmorTextureProvider;

public class MOreArmor extends ItemArmor implements IArmorTextureProvider{

    public MOreArmor(int i, EnumArmorMaterial enumarmormaterial, int j, int k)
    {
            super(i, enumarmormaterial, j, k);
    }
    
    public String getArmorTextureFile(ItemStack itemstack)
    {
            if(itemstack.itemID == MOreBase.helmetTitanium.itemID || itemstack.itemID == MOreBase.torsoTitanium.itemID || itemstack.itemID == MOreBase.bootsTitanium.itemID)
            {
                    return "/mOre/armor/titanium_1.png";
            }
            if(itemstack.itemID == MOreBase.legsTitanium.itemID)
            {
                    return "/mOre/armor/titanium_2.png";
            }
            return "/mOre/armor/titanium_1.png";
    }
    public String getTextureFile()
    {
    	return "/mOre/gui/items.png";
    }
}

MOreBase:

//armor material definition:
    static EnumArmorMaterial armorTITANIUM = EnumHelper.addArmorMaterial("TITANIUM", 29, new int[]{3,7,5,2}, 9);
//item definition
helmetTitanium = new MOreArmor(1019, armorTITANIUM,20,0).setIconIndex(88).setItemName("helmetTitanium").setCreativeTab(CreativeTabs.tabCombat);
    	torsoTitanium = new MOreArmor(1020, armorTITANIUM,20,1).setIconIndex(89).setItemName("torsoTitanium").setCreativeTab(CreativeTabs.tabCombat);
    	legsTitanium = new MOreArmor(1021, armorTITANIUM,20,2).setIconIndex(90).setItemName("legsTitanium").setCreativeTab(CreativeTabs.tabCombat);
    	bootsTitanium = new MOreArmor(1022, armorTITANIUM,20,3).setIconIndex(91).setItemName("bootsTitanium").setCreativeTab(CreativeTabs.tabCombat);

You need to add your armor:

RenderingRegistry.addNewArmourRendererPrefix

And what should i write in brackets?

Yeah and does it matters that i have my armor textures outside vanilla armor folder? Because i did exactly what you wrote and nothing happend.

 

its still not working!

oh, its working. Bad class