java.lang.IllegalArgumentException: bound must be positive
    at java.util.Random.nextInt(Unknown Source)
    at net.minecraftforge.fml.common.registry.VillagerRegistry$VillagerProfession.getRandomCareer(VillagerRegistry.java:234)
    at nightkosh.gravestone_extended.item.corpse.VillagerCorpseHelper.getDefaultCorpses(VillagerCorpseHelper.java:62)
    at nightkosh.gravestone_extended.item.corpse.CorpseHelper.getDefaultCorpse(CorpseHelper.java:127)
    at nightkosh.gravestone_extended.block.BlockCorpse.getSubBlocks(BlockCorpse.java:75)
    at net.minecraft.item.ItemBlock.getSubItems(ItemBlock.java:149)
    at net.minecraft.client.Minecraft.populateSearchTreeManager(Minecraft.java:586)
    at net.minecraft.client.Minecraft.init(Minecraft.java:528)
    at net.minecraft.client.Minecraft.run(Minecraft.java:3929)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)