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Feb 21, 2016 12:11 PM in response to htesch1017by léonie,Try to update Aperture to version 3.6, see this User Tip: Updating to Aperture 3.6 After the Release of Photos
If that is not possible, because you have been using Aperture 2, migrate your Aperture Library to the new Photos for Mac app, that comes with El Capitan. This will allow you to access all your photos, see Apple's document: How Photos handles content and metadata from iPhoto and Aperture - Apple Support