My code stops after "for each loop" node and i can't figure why. Need help

So this ActionBarUI do has this Skill Grid in it.

and it looks like this in the ActionBarUI

I’m now not sure what empty means here… Is this not supposed to get all the children of this “Skill Grid” and loop through them? It worked befor and nothing was changed on the grid or ActionBarUI.
So if this print strings zero does this means that it cannot recognise or access the “Skill grid” ?