Can not create a shell of a lofted body

Need help? We are here.
1

I have created a very simple body via the loft tool. One circle 20mm and another one 30mm slightly angled 20mm above.
The loft did work without any problem. But when I want to apply the shell tool to the „flat“ part I get the message „invalid selection“

Version on iPad : 5.770.0.7944
Version on Windows: 5.770.7944.0

I am not sure but I think it happens after the last update.

2

Hide the sketch first. Then select the surface to shell.

3

OMG. Thanks a lot! I did not seen the post 11d ago.