Yal Posted August 19 Share Posted August 19 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 Link to comment Share on other sites More 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JustDreaming Posted August 20 Share Posted August 20 Hi. Maybe you didn't set the attributes of the mob quite correctly. Or mod's attributes are not applied Quote Link to comment Share on other sites More sharing options...
Yal Posted August 21 Author Share Posted August 21 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 Link to comment Share on other sites More sharing options...
Yal Posted August 24 Author Share Posted August 24 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 Link to comment Share on other sites More sharing options...
Xoroshio Posted September 1 Share Posted September 1 The problem is probably with defining synched entity data. Can I see your code Quote Link to comment Share on other sites More sharing options...
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