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[Server thread/WARN] [minecraft/EntityType]: Exception loading entity: 
java.lang.NullPointerException: Cannot invoke "net.minecraft.world.entity.ai.attributes.AttributeSupplier.getValue(net.minecraft.world.entity.ai.attributes.Attribute)" because "this.supplier" is null
    at net.minecraft.world.entity.ai.attributes.AttributeMap.getValue(AttributeMap.java:76) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.LivingEntity.getAttributeValue(LivingEntity.java:1835) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.LivingEntity.getMaxHealth(LivingEntity.java:1656) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.LivingEntity.<init>(LivingEntity.java:235) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.Mob.<init>(Mob.java:123) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.entity.PathfinderMob.<init>(PathfinderMob.java:14) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.AgeableMob.<init>(AgeableMob.java:29) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.world.entity.animal.Animal.<init>(Animal.java:40) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.vulcandium.oceanicexpansion.entity.custom.TiamatEntity.<init>(TiamatEntity.java:24) ~[%23196!/:?] {re:classloading}
    at net.minecraft.world.entity.EntityType.create(EntityType.java:525) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.world.entity.EntityType.lambda$create$4(EntityType.java:530) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at java.util.Optional.map(Optional.java:260) ~[?:?] {}
    at net.minecraft.world.entity.EntityType.create(EntityType.java:529) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.world.entity.EntityType.loadStaticEntity(EntityType.java:607) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.world.entity.EntityType.loadEntityRecursive(EntityType.java:563) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.server.commands.SummonCommand.createEntity(SummonCommand.java:67) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.server.commands.SummonCommand.spawnEntity(SummonCommand.java:86) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at net.minecraft.server.commands.SummonCommand.lambda$register$1(SummonCommand.java:44) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
    at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:264) ~[brigadier-1.1.8.jar%23135!/:?] {}
    at net.minecraft.commands.Commands.performCommand(Commands.java:257) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.server.network.ServerGamePacketListenerImpl.performChatCommand(ServerGamePacketListenerImpl.java:1246) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:1223) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.thread.BlockableEventLoop.lambda$submitAsync$0(BlockableEventLoop.java:67) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
    at net.minecraft.server.TickTask.run(TickTask.java:18) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:156) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading}
    at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:770) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:161) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:130) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:753) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:747) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:139) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:733) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:665) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:251) ~[forge-1.20.1-47.2.19_mapped_parchment_2023.09.03-1.20.1.jar%23191!/:?] {re:classloading,pl:accesstransformer:B}
    at java.lang.Thread.run(Thread.java:840) ~[?:?] {}
[22:09:44] [Render thread/INFO] [minecraft/ChatComponent]: [System] [CHAT] Unable to summon entity

Posted

Put a reproducable example of your problem on github.

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

Posted
Quote

Put a reproducable example of your problem on github.

That means put the build of a project on github that demonstrates the issue.

Not random and incomplete code snippets out of context.

We need to see how the code fits together and maybe try it for ourselves if the problem is not obvious.

 

Anyway, If that really is all your code, you are missing the EntityAttributeCreationEvent for your mob.

https://forge.gemwire.uk/wiki/Making_Entities#Entity_Attributes

You seem to have a static method for this called setAttributes() in your code - but I guess nothing calls it?

Boilerplate:

If you don't post your logs/debug.log we can't help you. For curseforge you need to enable the forge debug.log in its minecraft settings. You should also post your crash report if you have one.

If there is no error in the log file and you don't have a crash report then post the launcher_log.txt from the minecraft folder. Again for curseforge this will be in your curseforge/minecraft/Install

Large files should be posted to a file sharing site like https://gist.github.com  You should also read the support forum sticky post.

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