For some reason I seem to be unable to remove the category "Uncategorized" from posts on my WordPress page http://www.karlshamnsaikido.se/. Since it's in Swedish it says "OKATEGORISERADE" instead of "Uncategorized" though. Whenever I edit a post and uncheck the box for "Uncategorized" and press update it just get checked again when the page reloads.
I have tried to do this logged in as administrator as well but it doesn't help. I have also tried removing the category from the category administration page and receive no error message when I do, but it just comes back.
Has anyone come across this problem and know how to correct it?