Hello,
I seem to have hit a bit of a pickle (or an afternoon brain fart) while trying to create a roll up.
Essentially what I'm trying to do is create a roll up of averages by month and my formula is returning an Invalid Data Error. I checked the reference columns and they are indeed date columns but beyond that, it should be pretty straight forward:
=AVG(COLLECT({Assigned People}, {Target Date}, MONTH(@cell) = Month@row))
Is there something glaringly obvious that I'm missing?