Go to the Object Editor and find Demon Hunter (Morphed).
Remove anything within the Required Animation Names, Required Animation Names - Attachments, Required Attachments Link Names, and Required Bone Names fields. This should solve your problem. These fields are all placed one after another, and they are under the "Art" section. If you wish to remove the fireball projectile attack you can tamper with the fields under "Combat".
Change the Range from 600 to 100. For the targets field remove "Air". Change the Attack Type to Hero, and remove everything under Area of Effect and Attack 1 Damage Factor. Only do this to Attack - 1. This is , at least, what the differences are between morphed and unmorphed demon hunters.