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Unable to summon entity

Posted August 19, 20241 yr

I am making a mod and I am new so I am using this tutorial by kaupenjoe: Forge Modding Tutorials - Minecraft 1.20.X - YouTube. I made a monster called the mine creeper but it doesn't work. Whenever I tried to summon it the error message Unable to summon entity appeared. When I checked the log it said this.

[19:25:28] [Render thread/INFO] [minecraft/ChatComponent]: [System] [CHAT] Unable to summon entity
[19:25:29] [Server thread/WARN] [minecraft/EntityType]: Exception loading entity:
java.lang.NullPointerException: Cannot invoke "net.minecraft.network.syncher.EntityDataAccessor.getId()" because "pKey" is null
   at net.minecraft.network.syncher.SynchedEntityData.define(SynchedEntityData.java:78) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.yal.yalmod.entity.custom.MineCreeperEntity.defineSynchedData(MineCreeperEntity.java:90) ~[%23194!/:?] {re:classloading}
   at net.minecraft.world.entity.Entity.<init>(Entity.java:260) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.world.entity.LivingEntity.<init>(LivingEntity.java:233) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.minecraft.world.entity.Mob.<init>(Mob.java:123) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.world.entity.PathfinderMob.<init>(PathfinderMob.java:14) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.minecraft.world.entity.monster.Monster.<init>(Monster.java:31) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.yal.yalmod.entity.custom.MineCreeperEntity.<init>(MineCreeperEntity.java:45) ~[%23194!/:?] {re:classloading}
   at net.minecraft.world.entity.EntityType.create(EntityType.java:525) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.world.entity.EntityType.lambda$create$4(EntityType.java:530) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at java.util.Optional.map(Optional.java:260) ~[?:?] {}
   at net.minecraft.world.entity.EntityType.create(EntityType.java:529) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.world.entity.EntityType.loadStaticEntity(EntityType.java:607) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.world.entity.EntityType.loadEntityRecursive(EntityType.java:563) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.server.commands.SummonCommand.createEntity(SummonCommand.java:67) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.server.commands.SummonCommand.spawnEntity(SummonCommand.java:86) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at net.minecraft.server.commands.SummonCommand.lambda$register$1(SummonCommand.java:44) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,xf:fml:forge:forge_method_redirector}
   at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:264) ~[brigadier-1.1.8.jar%23134!/:?] {}
   at net.minecraft.commands.Commands.performCommand(Commands.java:257) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.minecraft.server.network.ServerGamePacketListenerImpl.performChatCommand(ServerGamePacketListenerImpl.java:1244) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$11(ServerGamePacketListenerImpl.java:1221) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.util.thread.BlockableEventLoop.lambda$submitAsync$0(BlockableEventLoop.java:67) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?] {}
   at net.minecraft.server.TickTask.run(TickTask.java:18) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:156) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:23) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading}
   at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:772) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:161) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:130) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:755) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:749) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:139) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:735) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:667) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:251) ~[forge-1.20.1-47.0.19_mapped_parchment_2023.06.26-1.20.1.jar%23189!/:?] {re:classloading,pl:accesstransformer:B}
   at java.lang.Thread.run(Thread.java:840) ~[?:?] {}

Quote

August 20, 20241 yr

Hi. Maybe you didn't set the attributes of the mob quite correctly. Or mod's attributes are not applied

Quote

August 21, 20241 yr

Author

This is my attributes line, my mob is a monster

public static AttributeSupplier.Builder createAttributes() { return Monster.createMonsterAttributes().add(Attributes.MAX_HEALTH, 8.0).add(Attributes.MOVEMENT_SPEED, 0.0).add(Attributes.ATTACK_DAMAGE, 0.0 ).add(Attributes.FOLLOW_RANGE, 10.0); }

Quote

August 24, 20241 yr

Author

Updated it.

public static AttributeSupplier.Builder createAttributes() {

return Monster.createMonsterAttributes()

.add(Attributes.MAX_HEALTH, 8.0)

.add(Attributes.MOVEMENT_SPEED, 0.0)

.add(Attributes.ATTACK_DAMAGE, 0.0 )

.add(Attributes.FOLLOW_RANGE, 10.0)

.add(Attributes.ARMOR, 0)

.add(Attributes.ARMOR_TOUGHNESS, 0);

}

Quote

September 1, 20241 yr

The problem is probably with defining synched entity data.

Can I see your code

Quote

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Unable to summon entity

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