Mixing of Water in a Flat Bottom Mixer

Hi,

I am doing the tutorial for the Mixing of Water in a Flat Bottom Mixer model according the instructions available on the COMSOL site, and after I insert the geometry sequence and click the Build All button, I keep getting this error: You need to provide input entities, -Property: input. I cannot procede from there, because I cannot select any domains in the Physics tool bar. Any help and advice would be appreciated.

Thank you.

Alen