Exporting/importing settings within multisites

I'm using theme 3.7.11 and I have network set up. Now I'm trying to import main site settings into sub sites but in some reason import doesn't work. It keeps saying that isn't valid Atahualpa file. I tried files in /styles folder and these are working just fine. I tried to compare 2 files but can't see any reasons. Can any one advice please?