After the latest iPhoto update, I get this message whenever I try to open it: "Aperture library needs to be upgraded. To open this Aperture library in iPhoto, you need Aperture 3.3 or later. Click Update Aperture to buy the latest version of Aperture from the Mac App Store. After installing the update, open your library in Aperture to upgrade it." The problem is that I don't even own Aperture, so I can't update it or whatsoever. I've tried deleting the app and re-download it. I'm running Mac OSX 10.7.4 Macbook Air mid-2011.