MobHunting plugin requires 2 plugins to work Vault and BossShop. BossShop isn't anywhere in the plugins menu. When you are killing mobs in MobHunting they drop bags of gold which is the currency that BossShop takes, making it useless unless you have BossShop. Please add this plugin as it would further improve the MobHunting functionality and use. Thanks!
https://dev.bukkit.org/projects/bossshop
https://www.spigotmc.org/resources/bossshoppro-the-most-powerful-chest-gui-shop-menu-plugin.222/