Defining measure in flexible windows.

I just started using the flexible windows extension and have come across an odd error. When I try to define the “measure” of my window just like it’s shown in the documentation i get this error.

what gives?

The correct property is “measurement”. The docs do say that, although one of the examples says “measure” instead (which I will fix.)

well problem solved. I feel I always come up with the dumbest questions.

Not a dumb question at all. Just need for clarification.