In my Comic Easel config under custom post type it says: "This slug already exists and will cause problems. Change it." It is the bog-standard word "comic", which I have used since day one and don't particularly want to change. I don't understand why it would now say that. I haven't really changed anything recently except to add a child theme, which I have not edited yet. I also am new to websites and don't really understand the error (it scares me). My site is bubbleandsqueeeee.com if that helps.
Any help would really be appreciated.