Anvil tutorial. Subdivisions Surfice modifier creates a face where it should be a hole I wanted to make an anvil with a tutorial. But as I added the subsurf Modifier it started looking weird. I wanted to make a"Hole" but it fills it up. How can i get it right?
The marked edge (see green arrow) causes the problem, since it has influence on the subsurface modifier:


If you delete it, it will solve your problem.