java.lang.NoClassDefFoundError: io/lumine/xikage/mythicmobs/adapters/AbstractEntity
        at com.gmail.berndivader.mythicmobsquests.MythicMobsKillObjective.onMythicMobDeathEvent(MythicMobsKillObjective.java:51) ~[?:?]
        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor736.execute(Unknown Source) ~[?:?]
        at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.16.5.jar:git-Paper-794]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:624) ~[patched_1.16.5.jar:git-Paper-794]
        at org.bukkit.craftbukkit.v1_16_R3.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:850) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityLiving.d(EntityLiving.java:1598) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityLiving.die(EntityLiving.java:1520) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityLiving.damageEntity(EntityLiving.java:1362) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityMonster.damageEntity(EntityMonster.java:74) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityHuman.attack(EntityHuman.java:1196) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.EntityPlayer.attack(EntityPlayer.java:2022) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.PlayerConnection.a(PlayerConnection.java:2413) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:55) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:12) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.PlayerConnectionUtils.lambda$ensureMainThread$1(PlayerConnectionUtils.java:35) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.TickTask.run(SourceFile:18) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeTask(IAsyncTaskHandler.java:136) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.executeNext(IAsyncTaskHandler.java:109) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.bb(MinecraftServer.java:1271) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.executeNext(MinecraftServer.java:1264) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.IAsyncTaskHandler.awaitTasks(IAsyncTaskHandler.java:119) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.sleepForTick(MinecraftServer.java:1225) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1139) ~[patched_1.16.5.jar:git-Paper-794]
        at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291) ~[patched_1.16.5.jar:git-Paper-794]
        at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.ClassNotFoundException: io.lumine.xikage.mythicmobs.adapters.AbstractEntity
        at java.net.URLClassLoader.findClass(URLClassLoader.java:433) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:586) ~[?:?]
        at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:852) ~[?:?]
        at java.lang.ClassLoader.loadClass(ClassLoader.java:519) ~[?:?]
        ... 28 more