Flying ability for unit

[WebGamer60o]

I have downloaded model called "PaleVal'kyrSvH" can someone please help me get it to fly by using an ability? always when I try to make ability when he is flying the result is one of these
1. The unit gets stuck in ground
2. I get Fatal Error and game crashes
3. The Ability is just not working at all
does anyone know how to get him to fly? please help I don't know a lot about triggers too so I did not use any, I just made ability based on 'Storm Crow Form'

 

[Maker]

Create two versions of the unit. Give the other Fly movement type and some flying height. Set Art - Required animation names to alternate. Then use this method:
http://www.hiveworkshop.com/forums/general-mapping-tutorials-278/hero-passive-transformation-198482/

Make an ability that does nothing, when a unit Starts the effect of the ability, perform the passive transformation.

 

[Adiktuz]

or if the ability is usable, just use metamorphosis based spell and set the normal and alternate forms correctly (see above post for setting up normal and alternate forms)

@Maker - that method is actually for PASSIVE and PERMANENT transformation... which is more of meant to be used when you don't want to activate transformation via abilities and such...