[12:19:32 ERROR]: Could not pass event CreatureSpawnEvent to RandomMobNames v1.0.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:291) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.World.addEntity(World.java:1109) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.SpawnerCreature.spawnEntities(SpawnerCreature.java:195) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.WorldServer.doTick(WorldServer.java:185) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:750) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:643) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:549) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
Caused by: java.lang.IllegalArgumentException: bound must be positive
        at java.util.concurrent.ThreadLocalRandom.nextInt(Unknown Source) ~[?:1.8.0_65]
        at me.assist.randommobnames.RandomMobNames.onSpawn(RandomMobNames.java:71) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_65]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[paperspigot-1.7.10.jar:git-PaperSpigot-4b7fb38]
        ... 12 more