When i kill a Stack, nothin happens

[chouuul]

Hello everyone,

I wanted to share a problem that I have been facing with the StackMob plugin version 5.8.6 on Mohist 1.16.5. The plugin allows us to stack mobs in order to reduce lag on our servers. However, I have noticed that whenever I kill a stacked mob, nothing respawns and I lose everything that was stacked.

This issue is accompanied by the following error message:

Could not pass event EntityDeathEvent to StackMob v5.8.6 org.bukkit.event.EventException: null at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303) ~[forge:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:76) ~[forge:?] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[forge:?] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:593) ~[forge:?] at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:784) ~[forge:?] at net.minecraft.entity.LivingEntity.func_213345_d(LivingEntity.java:1534) ~[?:?] at net.minecraft.entity.LivingEntity.func_70645_a(LivingEntity.java:1476) ~[?:?] at net.minecraft.entity.LivingEntity.func_70097_a(LivingEntity.java:1322) ~[?:?] at net.minecraft.entity.passive.AnimalEntity.func_70097_a(AnimalEntity.java:76) ~[?:?] at net.minecraft.entity.player.PlayerEntity.func_71059_n(PlayerEntity.java:1219) ~[?:?] at net.minecraft.entity.player.ServerPlayerEntity.func_71059_n(ServerPlayerEntity.java:1657) ~[?:?] at net.minecraft.network.play.ServerPlayNetHandler.func_147340_a(ServerPlayNetHandler.java:2026) ~[?:?] at net.minecraft.network.play.client.CUseEntityPacket.func_148833_a(SourceFile:74) ~[?:?] at net.minecraft.network.play.client.CUseEntityPacket.func_148833_a(SourceFile:13) ~[?:?] at net.minecraft.network.PacketThreadUtil.lambda$ensureRunningOnSameThread$0(PacketThreadUtil.java:26) ~[?:?] at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?] at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(ThreadTaskExecutor.java:153) ~[?:?] at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?] at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:938) ~[?:?] at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:175) ~[?:?] at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(ThreadTaskExecutor.java:126) ~[?:?] at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:921) ~[?:?] at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:915) ~[?:?] at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(ThreadTaskExecutor.java:136) ~[?:?] at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:901) ~[?:?] at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:821) ~[?:?] at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:268) ~[?:?] at java.lang.Thread.run(Thread.java:831) ~[?:?] Caused by: java.lang.NoSuchMethodError: 'org.bukkit.event.entity.CreatureSpawnEvent$SpawnReason org.bukkit.entity.LivingEntity.getEntitySpawnReason()' at uk.antiperson.stackmob.config.EntityConfig.getDeathType(EntityConfig.java:270) ~[?:?] at uk.antiperson.stackmob.listeners.DeathListener.calculateDeath(DeathListener.java:85) ~[?:?] at uk.antiperson.stackmob.listeners.DeathListener.onStackDeath(DeathListener.java:37) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?] at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[forge:?] ... 27 more