Gather Failing?

Hey again. I'm making this spell, based on Wisp Gather, because I need a spell that will allow wisps to target and then encircle trees. However, when I change the data fields:

Data - Interval before changing trees

Data - Lumber per Interval

When I change them, the spell suddenly stops working and when I target trees, it says I need to target trees or entangled gold mines.

What I'm trying to do is make both fields nulled out completley, as neither lumber nor gold will be used in this game.

Any blindingly obvious answer?

Maybe just remove the wisps abilities and trigger the effect?

How? Gimme an example.

What did you change the values to? 0 and 0? Maybe just make Lumber Per Interval 0, and Interval before changing trees really high. Is it a big deal in the map if they change trees every once and a while?

If you alter either of them in any way it stops working.

BUMP'D!

Uh... as far as I know, if it's zero, it cannot gather from that resource.

I don't want it to gather, just target a tree, and then begin swirling around the tree like wisps do when gathering. The rest of the spell will be triggered. But I can't get them to do the former if I set these fields to zero, but I don't want them to constantly be getting lumber.