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[Solved][1.16.5] Issue with AttachCapabilitiesEvent for a custom Capability


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I have been working on a mod that has random disease events that periodically infect players. To store what disease a player has, I have tried creating a Capability. I do know Java but I am fairly new to 1.16.5 (just updated from 1.17.10 a week ago!). Looking at the EnergyStorage forge code and a couple of other topics on this forum, I have coded a Capability with only one error in the AttachCapabilitiesEvent when I run my mod. I have searched in the forge documentation and on this forum for a couple of days but haven't been able to find anything. Here s my code.


public interface IDiseases {
    int getDiseases();
    void setDiseases(int i);


public class Diseases implements IDiseases{

	private int diseases;
	public Diseases() {
	public int getDiseases() {
		return diseases;

	public void setDiseases(int i) {
		diseases = i;



public class DiseasesStorage implements IStorage<IDiseases>{

	public INBT writeNBT(Capability<IDiseases> capability, IDiseases instance, Direction side) {
		CompoundNBT tag = new CompoundNBT();
		tag.putInt("diseases", instance.getDiseases());
		return tag;

	public void readNBT(Capability<IDiseases> capability, IDiseases instance, Direction side, INBT nbt) {
		CompoundNBT tag = new CompoundNBT();



public class DiseasesProvider implements ICapabilitySerializable<INBT> {

	public static final Capability<IDiseases> DISEASES_CAPABILITY = null;

	private LazyOptional<IDiseases> instance = LazyOptional.of(DISEASES_CAPABILITY::getDefaultInstance);

	public <T> LazyOptional<T> getCapability(Capability<T> cap, Direction side) {
		return cap == DISEASES_CAPABILITY ? instance.cast() : LazyOptional.empty();

	public INBT serializeNBT() {
		return DISEASES_CAPABILITY.getStorage().writeNBT(DISEASES_CAPABILITY, this.instance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null);

	public void deserializeNBT(INBT nbt) {
		DISEASES_CAPABILITY.getStorage().readNBT(DISEASES_CAPABILITY, this.instance.orElseThrow(() -> new IllegalArgumentException("LazyOptional must not be empty!")), null, nbt);


Epidemics (Main Class):

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

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

	public Epidemics() {
		IEventBus bus = FMLJavaModLoadingContext.get().getModEventBus();

	public static void onRegisterItems(final RegistryEvent.Register<Item> event) {
		BlockInit.BLOCKS.getEntries().stream().map(RegistryObject::get).forEach(block -> {
			event.getRegistry().register(new BlockItem(block, new Item.Properties().tab(ItemGroup.TAB_MISC)).setRegistryName(block.getRegistryName()));
	public static void onCommonSetup(FMLCommonSetupEvent event) {
		CapabilityManager.INSTANCE.register(IDiseases.class, new DiseasesStorage(), Diseases::new);

	public static void onAttachCapabilities(AttachCapabilitiesEvent<Entity> event) {
		if (event.getObject() instanceof PlayerEntity) {
			event.addCapability(new ResourceLocation(Epidemics.MOD_ID, "diseases"), new DiseasesProvider());

The error:

[19:31:23] [modloading-worker-2/DEBUG] [ne.mi.fm.AutomaticEventSubscriber/LOADING]: Attempting to inject @EventBusSubscriber classes into the eventbus for epidemics
[19:31:23] [modloading-worker-2/DEBUG] [ne.mi.fm.AutomaticEventSubscriber/LOADING]: Auto-subscribing com.monkey.epidemics.Epidemics to MOD
[19:31:23] [modloading-worker-2/ERROR] [ne.mi.fm.ja.FMLModContainer/LOADING]: Failed to register automatic subscribers. ModID: epidemics, class com.monkey.epidemics.Epidemics
java.lang.IllegalArgumentException: Method public static void com.monkey.epidemics.Epidemics.onAttachCapabilities(net.minecraftforge.event.AttachCapabilitiesEvent) has @SubscribeEvent annotation, but takes an argument that is not a subtype of the base type interface net.minecraftforge.fml.event.lifecycle.IModBusEvent: class net.minecraftforge.event.AttachCapabilitiesEvent
	at net.minecraftforge.eventbus.EventBus.registerListener(EventBus.java:145) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.lambda$registerClass$2(EventBus.java:78) ~[eventbus-4.0.0.jar:?] {}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) ~[?:1.8.0_291] {}
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_291] {}
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) ~[?:1.8.0_291] {}
	at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[?:1.8.0_291] {}
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) ~[?:1.8.0_291] {}
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472) ~[?:1.8.0_291] {}
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) ~[?:1.8.0_291] {}
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) ~[?:1.8.0_291] {}
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:1.8.0_291] {}
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418) ~[?:1.8.0_291] {}
	at net.minecraftforge.eventbus.EventBus.registerClass(EventBus.java:78) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.eventbus.EventBus.register(EventBus.java:118) ~[eventbus-4.0.0.jar:?] {}
	at net.minecraftforge.fml.AutomaticEventSubscriber.lambda$inject$6(AutomaticEventSubscriber.java:75) ~[forge:?] {re:classloading}
	at java.util.ArrayList.forEach(ArrayList.java:1259) ~[?:1.8.0_291] {}
	at net.minecraftforge.fml.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:62) ~[forge:?] {re:classloading}
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:91) ~[forge:36.1] {re:classloading}
	at net.minecraftforge.fml.ModContainer.lambda$buildTransitionHandler$4(ModContainer.java:120) ~[forge:?] {re:classloading}
	at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1640) [?:1.8.0_291] {}
	at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1632) [?:1.8.0_291] {}
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_291] {}
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1067) [?:1.8.0_291] {}
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1703) [?:1.8.0_291] {}
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:172) [?:1.8.0_291] {}

I am still relatively new to 1.16.5 so Capabilities are still new and scary to me. I know I messed up the arguments somewhere but can't quite find it.

Edited by MonkeyKnight
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You've subscribed to the wrong event bus.

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.


Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.


DO NOT PM ME WITH PROBLEMS. No help will be given.

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  • MonkeyKnight changed the title to [Solved][1.16.5] Issue with AttachCapabilitiesEvent for a custom Capability

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