I have been trying to implement new capabilities into my mod, and I thought I had it working but I have encountered an error, with Crash report attached.
 

Main Class

@Mod(FantasyOres.MOD_ID)
@Mod.EventBusSubscriber(modid = FantasyOres.MOD_ID, bus = Mod.EventBusSubscriber.Bus.MOD)
public class FantasyOres
{

    public static final Logger LOGGER = LogManager.getLogger();
    public static final String MOD_ID = "fantasyores";

    public FantasyOres() {
        final IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::setup);
        FMLJavaModLoadingContext.get().getModEventBus().addListener(this::doClientStuff);

        EffectInit.EFFECTS.register(modEventBus);
        EffectInit.POTIONS.register(modEventBus);
        ItemInit.ITEMS.register(modEventBus);
        BlockInit.BLOCKS.register(modEventBus);
        BiomeInit.BIOMES.register(modEventBus);


        MinecraftForge.EVENT_BUS.register(this);
    }

    @SubscribeEvent
    public static void onRegisterItems(final RegistryEvent.Register<Item> event) {
        final IForgeRegistry<Item> registry = event.getRegistry();

        BlockInit.BLOCKS.getEntries().stream().map(RegistryObject::get).forEach(block -> {
            final Item.Properties properties = new Item.Properties().group(FantasyOres.TAB);
            final BlockItem blockItem = new BlockItem(block, properties);
            blockItem.setRegistryName(block.getRegistryName());
            registry.register(blockItem);
        });
    }

    @SubscribeEvent
    public static void onRegisterBiomes(final RegistryEvent.Register<Biome> event) {
        BiomeInit.registerBiomes();
    }

    private void setup(final FMLCommonSetupEvent event) {
        CapabilityManager.INSTANCE.register(IArmorSet.class, new ArmorSetInstance.Storage(), ArmorSetInstance::new);

    }

    private void doClientStuff(final FMLClientSetupEvent event) {
    }

    @SubscribeEvent
    public void onServerStarting(FMLServerStartingEvent event) {

    }


    @Mod.EventBusSubscriber(bus=Mod.EventBusSubscriber.Bus.MOD)
    public static class RegistryEvents {
    }

    @SubscribeEvent
    public static void LoadCompleteEVent(FMLLoadCompleteEvent event) {
        ModOreGen.GenerateOre();
    }

    public static final ItemGroup TAB = new ItemGroup("fantasyores_tab") {
        @Override
        public ItemStack createIcon() { return new ItemStack(BlockInit.UMBRIUM_ORE.get()); }
    };
}

IArmorSet interface

public interface IArmorSet {
    int getCount();
    void setCount(int amt);
}

ArmorSetInstance

public class ArmorSetInstance implements IArmorSet {

    private int setCount = 0;

    @Override
    public int getCount() {
        FantasyOres.LOGGER.info("GetCountCapability: " + setCount);
        return setCount; }

    @Override
    public void setCount(int amt) {
        setCount = amt;
        FantasyOres.LOGGER.info("SetCountCapability: " + setCount);}

    public static class Storage implements Capability.IStorage<IArmorSet> {

        @Nullable
        @Override
        public INBT writeNBT(Capability<IArmorSet> capability, IArmorSet instance, Direction side) {
            return IntNBT.valueOf(instance.getCount());
        }

        @Override
        public void readNBT(Capability<IArmorSet> capability, IArmorSet instance, Direction side, INBT nbt) {
            instance.setCount(((IntNBT) nbt).getInt());
        }
    }
}

ArmorSetCapability

public class ArmorSetCapability implements ICapabilitySerializable<IntNBT> {

    @CapabilityInject(IArmorSet.class)
    public static final Capability<IArmorSet> ARMOR_SET_CAPABILITY = null;
    private LazyOptional<IArmorSet> instance = LazyOptional.of(ARMOR_SET_CAPABILITY::getDefaultInstance);

    @Nonnull
    @Override
    public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
        return ARMOR_SET_CAPABILITY.orEmpty(cap, instance);
    }

    @Override
    public IntNBT serializeNBT() {
        return (IntNBT) ARMOR_SET_CAPABILITY.getStorage().writeNBT(ARMOR_SET_CAPABILITY, instance.orElseThrow(() -> new IllegalArgumentException("LazyOptional cannot be empty!")), null);
    }

    @Override
    public void deserializeNBT(IntNBT nbt) {
        ARMOR_SET_CAPABILITY.getStorage().readNBT(ARMOR_SET_CAPABILITY, instance.orElseThrow(() -> new IllegalArgumentException("LazyOptional cannot be empty!")), null, nbt);
    }
}

SetArmorItem

@Mod.EventBusSubscriber(modid = FantasyOres.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class SetArmorItem extends ArmorItem {

    private static int setCount = 0;
    private static int tick = 0;
    private static String set;

    public SetArmorItem(IArmorMaterial materialIn, EquipmentSlotType slot, Properties builder, String set) {
        super(materialIn, slot, builder);
        this.set = set;
    }

    public static void onEquipChange(LivingEquipmentChangeEvent e) {
        LivingEntity actor = e.getEntityLiving();
        if(!actor.world.isRemote()) {
            if ( actor instanceof PlayerEntity ) {
                setCount = getItemsInSet(); 
              //trimmed out the logic here to save space, 
              //does nothing with capabilities and is known good code. 
              //I just total the number of items equipped that belong to the set and store

                actor.getCapability(ArmorSetCapability.ARMOR_SET_CAPABILITY).ifPresent(cap -> cap.setCount(setCount));
            }
        }
    }

    private void armorCount(int i) {
        setCount = i;
        FantasyOres.LOGGER.info(i);
    }

  
    //Just here for debugging, not needed
    @Override
    public void onArmorTick(ItemStack stack, World world, PlayerEntity player) {
        if (tick % 100 == 0) {
          
            //player.getCapability(ArmorSetCapability.ARMOR_SET_CAPABILITY).ifPresent(cap -> armorCount(cap.getCount()));
        }

    }

CapabilitesEvent

@Mod.EventBusSubscriber(modid = FantasyOres.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE)
public class CapabilitiesEvent {

    private static int tick = 0;

    @SubscribeEvent
    public static void addCapability(AttachCapabilitiesEvent<Entity> e) {
        if (e.getObject() instanceof PlayerEntity){
            FantasyOres.LOGGER.info("addCapability fired for entity: " + e.getObject().getName());
            e.addCapability(new ResourceLocation(FantasyOres.MOD_ID, "umbriumsetcount"), new ArmorSetCapability());
        }
    }

}

I know its an error with the addCapability, but I cant tell what it is or how to correct it. I attempted to look at existing examples of code that implement custom capabilities, and that is partially what my code is based on, so it is possible I just missed a bit of code somewhere that is critical. And pointers would be helpful, thanks.

crash-2020-05-19_17.14.16-server.txt

50 minutes ago, kykaro said:

FantasyOres.LOGGER.info("addCapability fired for entity: " + e.getObject().getName());

You have a null pointer on this line.

Thank you very much, I need to fix this and then get some sleep apparently.