Stuck Preparing Library

I have been trying to launch the new Photos app with my aperture library but it just says on the 'Preparing Library' screen at 13% complete and not sure what to the issue is?
Initially it didn't find my library as it isn't in the Pictures folder, but another folder in my home directory. I have removed the one it created and re-launched Photos while holding down the Option key and selecting my Aperture library.
I have also restarted and used Disk Utilities to repair my HD and the permissions as apparently there were issues there when I verified disk and verified permissions.
It shouldn't be an iCloud library issue as I am just trying to open it for the first time. Lastly Photos is only using about 0.2% cpu. Library is about 118GB.
The library works fine in Aperture so not sure what else to try to get in to open in Photos... Any ideas?
Thanks in advance.

I have also restarted and used Disk Utilities to repair my HD and the permissions as apparently there were issues there when I verified disk and verified permissions.
try to repair and rebuild the Aperture library and the permissions of the library before upgrading it to Photos.
Firmly hold down the key combination ⌥⌘, while double clicking your Aperture Library in the "Pictures" folder to launch into the Aperture Library First Aid Tools. Select "Repair Permissions".
See: Aperture 3 User Manual: Repairing and Rebuilding Your Aperture Library
If permissions repair does not fix it, try the other first aid options, but make sure, you have a backup copy of your Aperture Library.

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Message was edited by: dm33

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