I have created a custom init for the mod entity type, a registry handler, client event bus subscriber, then entity model, the entity renderer, and the entity. I do see the entity using tab completion when typing /summon however it fails and says unable to summon entity.

[01:37:02] [Server thread/WARN] [minecraft/EntityType]: Exception loading entity: 
java.lang.NullPointerException: null
	at net.minecraft.entity.ai.attributes.AttributeModifierManager.func_233795_c_(AttributeModifierManager.java:67) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.func_233637_b_(LivingEntity.java:1848) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.getMaxHealth(LivingEntity.java:1609) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:208) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.MobEntity.<init>(MobEntity.java:107) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.CreatureEntity.<init>(CreatureEntity.java:13) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.AgeableEntity.<init>(AgeableEntity.java:20) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.passive.AnimalEntity.<init>(AnimalEntity.java:36) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.passive.TameableEntity.<init>(TameableEntity.java:33) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.passive.WolfEntity.<init>(WolfEntity.java:83) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at com.rena.entities.ExampleEntity.<init>(ExampleEntity.java:23) ~[main/:?] {re:classloading}
	at net.minecraft.entity.EntityType.create(EntityType.java:442) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.EntityType.lambda$loadEntityUnchecked$1(EntityType.java:453) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_251] {}
	at net.minecraft.entity.EntityType.loadEntityUnchecked(EntityType.java:452) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.EntityType.loadEntity(EntityType.java:510) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.EntityType.func_220335_a(EntityType.java:492) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.command.impl.SummonCommand.summonEntity(SummonCommand.java:49) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at net.minecraft.command.impl.SummonCommand.lambda$register$1(SummonCommand.java:33) ~[forge-1.16.1-32.0.44_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:262) ~[brigadier-1.0.17.jar:?] {}
	at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:176) ~[brigadier-1.0.17.jar:?] {}
	at net.minecraft.command.Commands.handleCommand(Commands.java:218) ~[?:?] {re:classloading}
	at net.minecraft.network.play.ServerPlayNetHandler.handleSlashCommand(ServerPlayNetHandler.java:1085) ~[?:?] {re:classloading}
	at net.minecraft.network.play.ServerPlayNetHandler.processChatMessage(ServerPlayNetHandler.java:1065) ~[?:?] {re:classloading}
	at net.minecraft.network.play.client.CChatMessagePacket.processPacket(CChatMessagePacket.java:40) ~[?:?] {re:classloading}
	at net.minecraft.network.play.client.CChatMessagePacket.processPacket(CChatMessagePacket.java:8) ~[?:?] {re:classloading}
	at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:19) ~[?:?] {re:classloading}
	at net.minecraft.util.concurrent.TickDelayedTask.run(TickDelayedTask.java:20) ~[?:?] {re:classloading}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.run(ThreadTaskExecutor.java:139) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.util.concurrent.RecursiveEventLoop.run(RecursiveEventLoop.java:22) ~[?:?] {re:classloading}
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:763) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:157) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveOne(ThreadTaskExecutor.java:109) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.driveOneInternal(MinecraftServer.java:746) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.driveOne(MinecraftServer.java:740) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.util.concurrent.ThreadTaskExecutor.driveUntil(ThreadTaskExecutor.java:122) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.runScheduledTasks(MinecraftServer.java:726) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:669) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.lambda$func_240784_a_$0(MinecraftServer.java:231) ~[?:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_251] {}
[01:37:02] [Render thread/INFO] [minecraft/NewChatGui]: [CHAT] Unable to summon entity

 

can you post your code?

Yes, I'm just not sure which part this error is pointing to so I don't know which needs to be uploaded.

1 hour ago, StolenBaron said:

Yes, I'm just not sure which part this error is pointing to so I don't know which needs to be uploaded.

Upload your entire mod, preferably as a git repository.

https://github.com/StolenBaron/RenasMobs_1.16.1

so it tells you your mob does not have the "maximum health" attribute which you will need to set them

 

and Ash has a detailed walk through and explanation on this

 

Edited July 7, 20205 yr by poopoodice