Trouble with extruding my walls

Hello! I’m having some trouble with extruding my walls as they either make everything I don’t want solid into a solid or don’t have a cap. I’ve tried to make them solid, re-doing my lines, delete recurring lines, selecting duplicate lines, going over lines showing an open curve and even caping the walls but it not working. I was wondering if anyone knew how to fix this issue?

@Hi13 Could you share a file? I can take a look.

At first glance it seems your curves are either not planar or not closed.