we need more information to get an idea what to suggest:
- What is your current Aperture version and what version of Mac OS X?
- Where is your Aperture library located? On an external drive or your system drive? Are the images referenced or managed?
- If the library is on external drive, what kind of drive, and how is it connected, directly or network volume?
- When did this start? Was there anything special before you could not open Aperture anymore? Did you install or upgrade new software? Were there any crashes?
To narrow the problem down: Create a new, empty Aperture library for testing and import some images. Can Aperture work with a new library? Then probably reinstalling will not help.
Thank you so much for offering to help me. I was gathering answers to your questions (OS X 10.7.5; 3.4.3; external, direct; when I tried to log in today, after a week away - the hard disc, a Fujitsu Siemens 1.5Gb drive, does die inexplicably sometimes, and this may have corrupted it I guess), when it suddenly decided to open! I have done nothing other than log in via a different login, attempted to open Aperture and got the same error message. I then logged in via the one I normally use, which failed so many times, on so many fronts, earlier; I read you answer and clicked on Aperture to get the version number to reply to you.......and it opened my library! I have no idea why, but what a relief!
Again, thank you for taking the time to help me, I really appreciate it.
I had the same problem today and called APPLE. I have an older version of APERTURE (Version 2.1.4). They sent me a very helpful pdf file that gave me steps to follow to restore my library. The very first step worked and all the photos in my 52 projects are back!
The first step said to hold the Option and Command keys as you start Aperture. The Aperture Library First Aid dialog will appear and offer options.
I hit "Rebuild Database" and after a few minutes all my pictures returned.
Does Aperture get confused with you delete a number of projects from the library? Is this "rebuilding" necessary after deleting a number of projects? Should I upgarde my Aperture (I will also have to upgrade my MAC OS) and am not sure I can on an older MacBook PRO? Advice???