CreatureSpawnEvent

Hi, i'm new with mythicmobs and i'm having this problem on my server console:

05.01 04:58:31 [Server] ERROR Could not pass event CreatureSpawnEvent to MythicMobs v4.2.0-SNAPSHOT 05.01 04:58:31 [Server] INFO org.bukkit.event.EventException: null 05.01 04:58:31 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.12.2.jar:git-Spigot-bb614f8-e40c9ef] 05.01 04:58:31 [Server] INFO at...

CreatureSpawnEvent