Exception thrown whilst executing task [Free 5.0.0]

Hello. I am getting console spam when enabling skills

: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task
 java.lang.AbstractMethodError: Missing implementation of resolved method 'abstract java.util.Collection getLocations(
act class io.lumine.xikage.mythicmobs.skills.targeters.ILocationSelector.
 	at io.lumine.xikage.mythicmobs.skills.AbstractSkill.evaluateTargets(AbstractSkill.java:456)
 	at io.lumine.xikage.mythicmobs.skills.AbstractSkill.evaluateTargets(AbstractSkill.java:432)
 	at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeSkills(SkillMechanic.java:366)
 	at io.lumine.xikage.mythicmobs.skills.SkillMechanic.execute(SkillMechanic.java:324)
 	at io.lumine.xikage.mythicmobs.skills.SkillManager.executeMobTimerSkills(SkillManager.java:386)
 	at io.lumine.xikage.mythicmobs.skills.SkillManager.runTimerSkills(SkillManager.java:368)
 	at io.lumine.xikage.mythicmobs.clock.MythicMobsAsyncClock.run(MythicMobsAsyncClock.java:21)
 	at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToConsumer.accept(Delegates.java:93)
 	at io.lumine.xikage.mythicmobs.utils.Schedulers$LumineTask.run(Schedulers.java:162)
 	at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftTask.run(CraftTask.java:101)
 	at org.bukkit.craftbukkit.v1_17_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
 	at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
 	at java.base/java.lang.Thread.run(Thread.java:831)