Curved Wall and Creating Wall From Mass

[dgreen.49364]

I have a simple mass, 15 ft. high, two sides are radial. I have created a void in the mass on one end to create a sloped wall. When I try to create a Wall by Face from the massing tools, they do no clean up correctly. When I do this with non-radial walls it cleans up fine. Is there an issue with trying to do this with radial walls? Please see the attachments. Hope it makes sense.
Thanks.

[dgreen.49364]

Anybody?????

[Carlos GT]

Try to create the solid using just the "solid blend" tool and not the solid extrusion with the void.