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Here's a simple example to solve this particular issue: public class ModArmorMaterials { public static final DeferredRegister<ArmorMaterial> ARMORS = DeferredRegister.create(Registries.ARMOR_MATERIAL, MyModName.MOD_ID); public static final RegistryObject<ArmorMaterial> COPPER = registerArmor("copper", Util.make(new EnumMap<>(ArmorItem.Type.class), enumMap -> { enumMap.put(ArmorItem.Type.BOOTS, 1); enumMap.put(ArmorItem.Type.LEGGINGS, 4); enumMap.put(ArmorItem.Type.CHESTPLATE, 5); enumMap.put(ArmorItem.Type.HELMET, 2); enumMap.put(ArmorItem.Type.BODY, 4); }), 12, SoundEvents.ARMOR_EQUIP_IRON, 0.0F, 0.0F, () -> Ingredient.of(Items.COPPER_INGOT)); private static RegistryObject<ArmorMaterial> registerArmor(String pGroup, EnumMap<ArmorItem.Type, Integer> pEnumMap, int pEnchantmentValue, Holder<SoundEvent> pEquipSound, float pToughness, float pKnockbackResistance, Supplier<Ingredient> pRepairIngredient) { List<ArmorMaterial.Layer> pLayerList = List.of(new ArmorMaterial.Layer(new ResourceLocation(pGroup))); return registerArmor(pGroup, pEnumMap, pEnchantmentValue, pEquipSound, pToughness, pKnockbackResistance, pRepairIngredient, pLayerList); } private static RegistryObject<ArmorMaterial> registerArmor( String pGroup, EnumMap<ArmorItem.Type, Integer> pEnumMap, int pEnchantmentValue, Holder<SoundEvent> pEquipSound, float pToughness, float pKnockbackResistance, Supplier<Ingredient> pRepairIngredient, List<ArmorMaterial.Layer> pLayerList) { return ARMORS.register(pGroup, () -> new ArmorMaterial(pEnumMap, pEnchantmentValue, pEquipSound, pRepairIngredient, pLayerList, pToughness, pKnockbackResistance)); } public static void register(IEventBus eventBus) { ARMORS.register(eventBus); } } Essentially, the TierSortingRegistry has been removed and so you now need to set up your own DeferredRegister. Please see the minecraftforge GitHub for more information; I found this solution through their issues (https://github.com/MinecraftForge/MinecraftForge/issues/9961)

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How did I even leave that in there? I’ll try it in a bit, that very well could be it.

Greetings, I met a problem with my Forge server (47.2.0-1.20.1) that I can't join with the following line. (singleplayer world working fine) [net.minecraft.server.network.ServerGamePacketListenerImpl/]: Sharyna lost connection: Internal Exception: io.netty.handler.codec.EncoderException: java.lang.NullPointerException: Cannot invoke "net.minecraft.resources.ResourceLocation.toString()" because "p_130086_" is null   At first it was errored with packet size error, but I fixed that with the Connectivity mod, however, after that this popped up and can't find the source of it. Since the logs are big, I couldn't upload on paste.gg or other site ... so here it is (if the files are deleted, please notice me and I'll upload again. Debug and Latest log

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