[01:47:38 WARN]: [Multiverse-Core] "Multiverse-Core v4.1.0-b775" has registered a listener for org.bukkit.event.entity.EntityCreatePortalEvent on method "public void com.onarandombox.MultiverseCore.listeners.MVPortalListener.entityPortalCreate(org.bukkit.event.entity.EntityCreatePortalEvent)", but the event is Deprecated. "Server performance will be affected"; please notify the authors [Rigby, fernferret, lithium3141, main--, dumptruckman].

This message is nothing to worry about, see the message right below it! Closing this as a duplicate of #2000.