Ok, I don’t know why there are two folders for source files and I don’t know why files get placed under intermediate when I created them in the source/project folder inside VS. Anyway, I moved them as you said and used “add existing element” to add them back to the project. But I still get the errors.
Ok, thanks for help. I got a little confused, because I was having my other question (about interfaces) in mind. The files are being found now, so thanks for help! The errors were something else, but they are solved now, too.