Spell Problem: Dark Conversion

I made a custom spell out of this spell, and i replaced the unit data, duration, etc... and i cannot for some reason use this spell on normal units. Like footman.

Can someone help me?

you can change the allowed targets field at the bottom of the values of the Spell there u have to set it to
1. ground
2. air
3. friend (if u want it on friends)
4.vunerable
5.invunerable
6.not-self
7.not-hero
8.not ancient

I think you mean you can't give that ability to a footman?

Simply go to that ability and make "Hero abability - false"

Edit:

I get you wrong...

Its something with targets allowed, That spell is from undeads right?

Well as tooltip says:

Puts a target villager to sleep and converts it into a zombie.

I guess the easiest way is to trigger it. Make stormbolt as a base (cast) spell, change the buff, so it would look like sleep (even if it's stunn) Then trigger the spell, by simply using "Unit -Replace unit" with the current one, and make a zombie

Change "Race to convert" to Human to make it able to convert human units.