I have problems using the "measure" tool for a surface. When I use it for a simple shape (rectangle, circle...) it works well. In my construction, I use only lines and radius to do my construction, then I group them in a block to create an entity. When I select it in the measure area tool, the command box says 'The selected entity doesn't possess an area". I checked if my construction was closed, and yes it is...

I'm currently testing this product for my company , and this function of measuring areas is crucial for us.

Thanks in advance,