java.util.ConcurrentModificationException: null
[00:14:52] [Server thread/ERROR]: Entity threw exception at Dungeon:-146.90530812726746,-60.0,-105.50695599249582 java.util.ConcurrentModificationException: null at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:756) ~[?:?] at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:778) ~[?:?] at net.minecraft.world.entity.ai.goal.GoalSelector.tickRunningGoals(GoalSelector.java:155) ~[?:?] at net.minecraft.world.entity.ai.goal.GoalSelector.tick(GoalSelector.java:148) ~[?:?] at net.minecraft.world.entity.Mob.serverAiStep(Mob.java:958) ~[?:?] at net.minecraft.world.entity.LivingEntity.aiStep(LivingEntity.java:3438) ~[?:?] at net.minecraft.world.entity.Mob.aiStep(Mob.java:704) ~[?:?] at net.minecraft.world.entity.AgeableMob.aiStep(AgeableMob.java:155) ~[?:?] at net.minecraft.world.entity.animal.Animal.aiStep(Animal.java:64) ~[?:?] at net.minecraft.world.entity.LivingEntity.tick(LivingEntity.java:3093) ~[?:?] at net.minecraft.world.entity.Mob.tick(Mob.java:460) ~[?:?] at net.minecraft.server.level.ServerLevel.tickNonPassenger(ServerLevel.java:1435) ~[?:?] at net.minecraft.server.level.ServerLevel.lambda$tick$12(ServerLevel.java:896) ~[?:?] at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:42) ~[purpur-1.20.1.jar:git-Purpur-2014] at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:873) ~[?:?] at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1586) ~[purpur-1.20.1.jar:git-Purpur-2014] at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:487) ~[purpur-1.20.1.jar:git-Purpur-2014] at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1421) ~[purpur-1.20.1.jar:git-Purpur-2014] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1192) ~[purpur-1.20.1.jar:git-Purpur-2014] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) ~[purpur-1.20.1.jar:git-Purpur-2014] at java.lang.Thread.run(Thread.java:833) ~[?:?] [00:14:52] [Server thread/ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task [00:14:52] [Server thread/WARN]: java.lang.IllegalStateException: Already retired [00:14:52] [Server thread/WARN]: at io.papermc.paper.threadedregions.EntityScheduler.retire(EntityScheduler.java:66) [00:14:52] [Server thread/WARN]: at net.minecraft.world.entity.Entity.retireScheduler(Entity.java:4851) [00:14:52] [Server thread/WARN]: at net.minecraft.world.entity.Entity.b(Entity.java:4836) [00:14:52] [Server thread/WARN]: at net.minecraft.world.entity.Entity.a(Entity.java:747) [00:14:52] [Server thread/WARN]: at net.minecraft.world.entity.EntityLiving.a(EntityLiving.java:765) [00:14:52] [Server thread/WARN]: at net.minecraft.world.entity.Entity.ai(Entity.java:729) [00:14:52] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_20_R1.entity.CraftEntity.remove(CraftEntity.java:728) [00:14:52] [Server thread/WARN]: at MythicMobs-5.3.5.jar//io.lumine.mythic.bukkit.adapters.BukkitEntity.lambda$remove$0(BukkitEntity.java:355) [00:14:52] [Server thread/WARN]: at MythicMobs-5.3.5.jar//io.lumine.mythic.bukkit.utils.Delegates$RunnableToSupplier.get(Delegates.java:121) [00:14:52] [Server thread/WARN]: at MythicMobs-5.3.5.jar//io.lumine.mythic.bukkit.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654) [00:14:52] [Server thread/WARN]: at MythicMobs-5.3.5.jar//io.lumine.mythic.bukkit.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70) [00:14:52] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftTask.run(CraftTask.java:101) [00:14:52] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_20_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480) [00:14:52] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1507) [00:14:52] [Server thread/WARN]: at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:487) [00:14:52] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1421) [00:14:52] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:1192) [00:14:52] [Server thread/WARN]: at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:323) [00:14:52] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:833)