Could not pass event EntityDamageByEntityEvent

[VioleLine]

The damage indicator does not work correctly. On version 1.56.0, it gives an error to the console with each damage, on 1.48.0 there is no such thing.

I tried to remove the check, everything works perfectly:
DamageIndicatorListener.kt
if (event.entity is Allay) { return }

Error in console:
[23:46:30] [Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to EcoSkills v1.56.0 java.lang.NoClassDefFoundError: org/bukkit/entity/Allay at com.willfp.ecoskills.stats.DamageIndicatorListener.onEntityDamageByEntity(DamageIndicatorListener.kt:43) ~[EcoSkills-1.56.0-all.jar:?] at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor148.execute(Unknown Source) ~[?:?] at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:75) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:git-Paper-386] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:669) ~[paper-api-1.18.2-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.v1_18_R2.event.CraftEventFactory.callEvent(CraftEventFactory.java:248) ~[paper-1.18.2.jar:git-Paper-386] at org.bukkit.craftbukkit.v1_18_R2.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:1149) ~[paper-1.18.2.jar:git-Paper-386] at org.bukkit.craftbukkit.v1_18_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:1008) ~[paper-1.18.2.jar:git-Paper-386] at org.bukkit.craftbukkit.v1_18_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:962) ~[paper-1.18.2.jar:git-Paper-386] at org.bukkit.craftbukkit.v1_18_R2.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:1183) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.world.entity.LivingEntity.damageEntity0(LivingEntity.java:2065) ~[?:?] at net.minecraft.world.entity.player.Player.damageEntity0(Player.java:1031) ~[?:?] at net.minecraft.world.entity.LivingEntity.hurt(LivingEntity.java:1346) ~[?:?] at net.minecraft.world.entity.player.Player.hurt(Player.java:938) ~[?:?] at net.minecraft.server.level.ServerPlayer.hurt(ServerPlayer.java:1032) ~[?:?] at net.minecraft.world.entity.Mob.doHurtTarget(Mob.java:1585) ~[?:?] at net.minecraft.world.entity.ai.goal.MeleeAttackGoal.checkAndPerformAttack(MeleeAttackGoal.java:130) ~[?:?] at net.minecraft.world.entity.ai.goal.MeleeAttackGoal.tick(MeleeAttackGoal.java:121) ~[?:?] at net.minecraft.world.entity.ai.goal.WrappedGoal.tick(WrappedGoal.java:63) ~[?:?] at net.minecraft.world.entity.ai.goal.GoalSelector.tickRunningGoals(GoalSelector.java:151) ~[?:?] at net.minecraft.world.entity.Mob.serverAiStep(Mob.java:849) ~[?:?] at net.minecraft.world.entity.LivingEntity.aiStep(LivingEntity.java:3275) ~[?:?] at net.minecraft.world.entity.Mob.aiStep(Mob.java:627) ~[?:?] at net.minecraft.world.entity.monster.Monster.aiStep(Monster.java:44) ~[?:?] at net.minecraft.world.entity.LivingEntity.tick(LivingEntity.java:2917) ~[?:?] at net.minecraft.world.entity.Mob.tick(Mob.java:395) ~[?:?] at net.minecraft.world.entity.monster.Spider.tick(Spider.java:85) ~[?:?] at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:1135) ~[?:?] at net.minecraft.world.level.Level.guardEntityTick(Level.java:936) ~[?:?] at net.minecraft.server.level.ServerLevel.lambda$tick$5(ServerLevel.java:674) ~[?:?] at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:42) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:654) ~[?:?] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1593) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:483) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1456) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1226) ~[paper-1.18.2.jar:git-Paper-386] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:316) ~[paper-1.18.2.jar:git-Paper-386] at java.lang.Thread.run(Thread.java:833) ~[?:?] Caused by: java.lang.ClassNotFoundException: org.bukkit.entity.Allay ... 39 more