Hi,
A short while ago, I met the same question as your's. I was soon searching for it, but when I seen this article, I realized I must done it by myself.
Actruely, the error "Couldn't Create Region" I met was that the Window identifier added by something. You must keep the Window identifier within StrokeIt's Command Editor is blank. So swep them and problem will be go away.
I'm also a user of StrokIt, so this not normal. otherwise, you will be find out the answer though the Google.
good luck.