[20:34:49 ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task
[20:34:49 WARN]: java.lang.NoClassDefFoundError: org/bukkit/entity/AbstractArrow
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.adapters.bukkit.BukkitSkillAdapter.shootProjectile(BukkitSkillAdapter.java:261)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.ShootMechanic.shoot(ShootMechanic.java:292)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.ShootMechanic.castAtLocation(ShootMechanic.java:217)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.lambda$executeTargetedLocationSkill$6(SkillMechanic.java:472)
[20:34:49 WARN]:        at java.lang.Iterable.forEach(Iterable.java:75)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeTargetedLocationSkill(SkillMechanic.java:468)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.lambda$executeSkills$2(SkillMechanic.java:421)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToSupplier.get(Delegates.java:121)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.promise.LuminePromise.executeSync(LuminePromise.java:133)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.promise.LuminePromise.supplySync(LuminePromise.java:264)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.promise.Promise.supply(Promise.java:435)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.promise.Promise.supplying(Promise.java:104)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.tasks.TaskScheduler.run(TaskScheduler.java:63)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeSkills(SkillMechanic.java:421)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.execute(SkillMechanic.java:326)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.Skill.execute(Skill.java:270)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.Skill.execute(Skill.java:245)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.MetaSkillMechanic.cast(MetaSkillMechanic.java:92)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeSkills(SkillMechanic.java:379)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic$1.run(SkillMechanic.java:313)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToConsumer.accept(Delegates.java:93)
[20:34:49 WARN]:        at io.lumine.xikage.mythicmobs.utils.Schedulers$LumineTask.run(Schedulers.java:162)
[20:34:49 WARN]:        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:64)
[20:34:49 WARN]:        at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:423)
[20:34:49 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:840)
[20:34:49 WARN]:        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423)
[20:34:49 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774)
[20:34:49 WARN]:        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666)
[20:34:49 WARN]:        at java.lang.Thread.run(Thread.java:748)
BOSS出现受伤只掉0血。但是可以放技能 服务端paper1.12.2

你安装的是什么版本的，看上去不兼容 1.12.2