How to add armor to forge 1.16.5

[Unpuzzledmind32]

so i am trying to add armor but i can't get it to do it what am i doing wrong

 

my code:

package com.jerios.pearlarmor.items;

import java.util.function.Supplier;

import net.minecraft.inventory.EquipmentSlotType;
import net.minecraft.item.IArmorMaterial;
import net.minecraft.item.Items;
import net.minecraft.item.crafting.Ingredient;
import net.minecraft.util.SoundEvent;
import net.minecraft.util.SoundEvents;

public enum ModArmorMaterial implements IArmorMaterial {
    ;

    GOLD("gold", 7, new int[]{1, 3, 5, 2}, 25, SoundEvents.ARMOR_EQUIP_GOLD, 0.0F, 0.0F, () -> {
        return Ingredient.of(Items.GOLD_INGOT);

    @Override
    public int getDurabilityForSlot(EquipmentSlotType p_200896_1_) {
        return 0;
    }

    @Override
    public int getDefenseForSlot(EquipmentSlotType p_200902_1_) {
        return 0;
    }

    @Override
    public int getEnchantmentValue() {
        return 0;
    }

    @Override
    public SoundEvent getEquipSound() {
        return null;
    }

    @Override
    public Ingredient getRepairIngredient() {
        return null;
    }

    @Override
    public String getName() {
        return null;
    }

    @Override
    public float getToughness() {
        return 0;
    }

    @Override
    public float getKnockbackResistance() {
        return 0;
    }
}