Odd...
oh.. it looks like skeleton.atlas.txt is being exported but it has no images? do you have an Empty Skeleton in your Spine project? if not, try deleting skeleton.json, skeleton.atlas.txt, and skeleton_Atlas.asset files then right click on Rozzel.atlas.txt and choose reimport - if that works then right click on Rozzel.json and also click reimport.
I think this might be an issue of trying to import a Skeleton with no Atlas pages hah...