Gem of recall ability problem

I want to turn the item recall ability (the one that brings 12 units to the caster) into a hero ability and change the targets. But whenever I change the targets the spell tells me to select target units (enen though I am). Does anyone know how to fix this?

What targets did you cahnge it to? The targets in question might not conform to the spell targets. This includes the *Non-Unit* ones...

Otherwise, it should work fine. emote_confused

Well, Gem of Recall and Dark Summoning seem to have problems when you make them target enemy or allied units instead of player units. You'll have to use triggers if you wish to edit the targets.

thanks, but i know not one thing about using triggers