Well one problem down!
Class None error i believe is from deleting a class/bp but it is still in level/referenced somewhere (usually doesn’t happen), but I don’t think it will make it fail outright.
Just a general/random tip , make a backup of your project, try deleting (or moving it out of your project folder) the intermediate, saved, and build folders. This may make you lose some project/build settings, but forces a clean packaging.