Question Help, Exception ticking world

[Jolunas]

I got this constant crash

java.lang.IllegalStateException: Already retired
at io.papermc.paper.threadedregions.EntityScheduler.retire(EntityScheduler.java:66)
at net.minecraft.world.entity.Entity.retireScheduler(Entity.java:4711)
at net.minecraft.world.entity.Entity.setRemoved(Entity.java:4696)
at net.minecraft.world.entity.Entity.remove(Entity.java:698)
at net.minecraft.world.entity.LivingEntity.remove(LivingEntity.java:760)
at net.minecraft.world.entity.Entity.discard(Entity.java:680)
at net.minecraft.world.entity.Mob.checkDespawn(Mob.java:881)
at net.minecraft.server.level.ServerLevel.lambda$tick$12(ServerLevel.java:858)
at net.minecraft.world.level.entity.EntityTickList.forEach(EntityTickList.java:42)
at net.minecraft.server.level.ServerLevel.tick(ServerLevel.java:852)
at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1555)
at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:447)
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1394)
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1171)
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318)
at java.base/java.lang.Thread.run(Thread.java:833)


Anyone does know what is this?