All the checks say the nurbs object is valid?

Hello, Im wondering if someone can tell me why I cannot mesh this object?
Chinaball cap.3dm (986.1 KB)

You have a lot of intersecting surfaces, and coincident surfaces at the bottom of your model.

Thanks Richard. And how did you discover that if all of the checks indicated that it was a valid model?
By just exploding it?

Yes, by actually looking at the geometry to see where errors could be hiding.

Thanks very much for your time Richard!