It might be double files of something in your particle folder.
Open your FeralHeart folder, media -> particles and if example have two of example aura, or maybe even three of them. Delete two of them, example aura_0 and aura_1.
Still nothing, try to restart your computer, and if it still doesnt work then uninstall FeralHeart, remove the folder and all files in it and then install it again.