Hello, in the attached project, I defined a cantilever slab without beams on 8 axis on the ground floor as an example. When you do this, the program gives an error and ends the analysis. But when the beam turns around the floor like on other floors, there is no problem. When you check the Geometry, it says "Incorrect Beam Level" for the KZ14 beam. but when I delete the beam and do ctrl+Z this error goes away. When I delete it, do ctrl+Z, save and then reopen the file, it gives an error again. I would be very happy if you examine the file and share information about the problem. I wish everyone good work.