Having trouble rounding corners

I have a few of these shapes with different animals, but this is the onlyfilv that I can’t seem to round the corners at 1.0. I have tried everything. Is it becasue the polygon (rectangle isn’t a perfect square? My other files worked without a hitch.

dog cant round corners at 1.0.lbrn2 (26.7 KB)

You have to Ungroup first .

Duh! (lol) Sorry. I am moving too fast.