This mod requires the WatkinsBase mod to run. You can find a link to it on the MinecraftForum thread or the Curse page.
If adding WatkinsBase to your mods folder does not fix a problem you are having, please post a comment on the MinecraftForum thread about it including an error log.

Please note that ANY posts regarding an error without an error log will most likely be ignored. (This does not include in-game bugs where an error log will not be generated)