Neutral Building- Remove Unit Type from Shop

How come this trigger doesn't work? I want it so once the hero is bought it removed like when you buy from a a tavern.

Anti Mass Hero
Events
Unit - A unit Sells a unit
Conditions
((Sold unit) is A Hero) Equal to True
Actions
Neutral Building - Remove (Unit-type of (Sold unit)) from (Selling unit)

Yes the selling unit has the sell units ability.

Is the selling unit a nuetral (nuetral is a classification that buildings like taverns have, not the actual player Nuetral ) building?

Remove Unit-Type from stock only works if the unit-type has been added via triggers before.
So you have to clear the units-sold field of the tavern in the object editor and at map initialization add the unit type to the shop with a trigger.

THANKS!

And yes its a nEUtral building

That Didn't work, I put in a trigger at map initialization that adds all the units to the buildings with a stock of 1 and max stock of 1 yet there is nothing there :/

Try after the time elapsed is .01 seconds.. Sometimes Map Init doesn't work for certain triggers.

It does work, funny thing actually, the one building that did not have sell units ability was the one I kept checking :/