[08:00:48 INFO]: [Multiverse-Core] Enabling Multiverse-Core v4.2.2-b812
[08:00:48 INFO]: [Multiverse-Core] §aWe are aware of the warning about the deprecated event. There is no alternative that allows us to do what we need to do and performance impact is negligible. It is safe to ignore.
[08:00:48 WARN]: [Multiverse-Core] Cannot load worlds.yml
[08:00:48 INFO]: [Multiverse-Core] Loading World & Settings - 'world' - Env: NORMAL - Type: FLAT & seed: 0
[08:00:48 ERROR]: Error occurred while enabling Multiverse-Core v4.2.2-b812 (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/entity/Phantom
at com.onarandombox.MultiverseCore.utils.SimpleWorldPurger.killDecision(SimpleWorldPurger.java:152) ~[?:?]
at com.onarandombox.MultiverseCore.utils.SimpleWorldPurger.purgeWorld(SimpleWorldPurger.java:119) ~[?:?]
at com.onarandombox.MultiverseCore.utils.SimpleWorldPurger.purgeWorld(SimpleWorldPurger.java:197) ~[?:?]
at com.onarandombox.MultiverseCore.utils.SimpleWorldPurger.purgeWorld(SimpleWorldPurger.java:74) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld$SpawningPropertyValidator.validateChange(MVWorld.java:286) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld$SpawningPropertyValidator.validateChange(MVWorld.java:260) ~[?:?]
at com.onarandombox.serializationconfig.SerializationConfig.SerializationConfig.validate(SerializationConfig.java:893) ~[?:?]
at com.onarandombox.serializationconfig.SerializationConfig.SerializationConfig.setPropertyValue(SerializationConfig.java:443) ~[?:?]
at com.onarandombox.serializationconfig.SerializationConfig.SerializationConfig.setPropertyValue(SerializationConfig.java:368) ~[?:?]
at com.onarandombox.serializationconfig.SerializationConfig.SerializationConfig.setPropertyValue(SerializationConfig.java:353) ~[?:?]
at com.onarandombox.serializationconfig.SerializationConfig.SerializationConfig.setPropertyValueUnchecked(SerializationConfig.java:736) ~[?:?]
at com.onarandombox.MultiverseCore.WorldProperties.setAllowAnimalSpawn(WorldProperties.java:424) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld.setAllowAnimalSpawn(MVWorld.java:767) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld.validateEntitySpawns(MVWorld.java:195) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld.validateProperties(MVWorld.java:205) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld.(MVWorld.java:94) ~[?:?]
at com.onarandombox.MultiverseCore.MVWorld.(MVWorld.java:59) ~[?:?]
at com.onarandombox.MultiverseCore.utils.WorldManager.doLoad(WorldManager.java:509) ~[?:?]
at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:286) ~[?:?]
at com.onarandombox.MultiverseCore.utils.WorldManager.addWorld(WorldManager.java:228) ~[?:?]
at com.onarandombox.MultiverseCore.utils.WorldManager.loadDefaultWorlds(WorldManager.java:714) ~[?:?]
at com.onarandombox.MultiverseCore.MultiverseCore.onEnable(MultiverseCore.java:306) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[patched.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332) [patched.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:407) [patched.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:359) [patched.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:318) [patched.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:408) [patched.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:372) [patched.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:327) [patched.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:267) [patched.jar:git-PaperSpigot-"4c7641d"]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:563) [patched.jar:git-PaperSpigot-"4c7641d"]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_275]
Caused by: java.lang.ClassNotFoundException: org.bukkit.entity.Phantom
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:92) ~[patched.jar:git-PaperSpigot-"4c7641d"]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:87) ~[patched.jar:git-PaperSpigot-"4c7641d"]
at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_275]
at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_275]
... 33 more
[08:00:48 INFO]: [Multiverse-Core] Disabling Multiverse-Core v4.2.2-b812

Anyone know how to fix this?

MC 1.8.x You will need to use an even older version of Multiverse - 2.5 should work (not the same as 2.5.0): https://dev.bukkit.org/projects/multiverse-core/files/898527

ty