Tessellation issue with flow analysis mesh

Dear all,

I was trying the inverter tutorial (with no heat transfer) and I get an issue during meshing (Simulation mode).

I've only italian screen, I'll try to get in english soon and attach here.

Fast translation is like:

"Impossible to get tessellation from input geometry. Check geometry. In case of external fluid problem use general tessellation changin 'tessellation type' and retry."

Does anyone get this error?

Thanks for the answer