Updated iMac to Yosemite.  Now when in LR5 and try to edit photo in PS CS5 I get error 15 and it will not open.  I've uninstalled PS and reinstalled it but still get the same error.  Any thoughts out there.

I just upgraded my iMac to Yosemite.  Now when in LR5 and try to edit a photo in PS CS5 I get error message 15.  It says to uninstall and reinstall PS CS5.  Done that and error is still there.  I can open PS outside of LR but not inside.  Any thoughts?

The first thing I would suggest is for you to go to the folder containing your catalog, using your system browser. There will be a folder that has the extension .lrdata. Delete that folder, and then try to start Lightroom. If that doesn't work, replace your catalog with your most recent backup.

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