Bukkit

Okay so basicly, when i hit a protected mob nothing happens, mob does not take damage, message gets displayed properly.

When i open console tho i see this

1.01 17:24:31 [Server] ERROR Could not pass event EntityDamageByEntityEvent to PetProtect v1.11
11.01 17:24:31 [Server] INFO java.lang.NoSuchMethodError: org.bukkit.entity.Projectile.getShooter()Lorg/bukkit/entity/LivingEntity;
11.01 17:24:31 [Server] INFO at me.muizers.PetProtect.PetProtect.onEntityDamageByEntity(PetProtect.java:397) ~[?:?]
11.01 17:24:31 [Server] INFO at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor281.execute(Unknown Source) ~[?:?]
11.01 17:24:31 [Server] INFO at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:607) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:244) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:1038) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:925) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:881) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:1070) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityLiving.damageEntity0(EntityLiving.java:1830) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityLiving.damageEntity(EntityLiving.java:1165) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityMonster.damageEntity(EntityMonster.java:52) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityArrow.a(EntityArrow.java:333) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.IProjectile.a(IProjectile.java:125) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityArrow.tick(EntityArrow.java:176) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.EntityTippedArrow.tick(EntityTippedArrow.java:92) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.WorldServer.entityJoinedWorld(WorldServer.java:845) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.World.a(World.java:886) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.WorldServer.doTick(WorldServer.java:530) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.MinecraftServer.b(MinecraftServer.java:1351) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:377) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1204) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:992) ~[patched_1.16.4.jar:git-Paper-393]
11.01 17:24:31 [Server] INFO at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:173) ~[patched_1.16.4.jar:git-Paper-393]

 It would be cool to see that patched.