i am getting a error in console

Caused by: java.lang.IllegalArgumentException: Specified enchantment cannot be applied to this itemstack
at org.bukkit.inventory.ItemStack.addEnchantment(ItemStack.java:301)
at com.modcrafting.diablodrops.drops.DropsAPI.getItem(DropsAPI.java:74)
at com.modcrafting.diablodrops.drops.DropsAPI.getItem(DropsAPI.java:140)
at com.modcrafting.diablodrops.listeners.KillListener.onSpawn(KillListener.java:68)

i am going to revert back to old version till there is a fix

This will be fixed in a new release soon. The code that's in place fixes this already.