If the message is that the files cannot be read (is that correct?) then you need to change the permissions on the Destination folder to Read & Write permission.
It’s usually necessary to trash the prefs after updating OSX to Yosemite. Start by quitting Lightroom 5.
Launch Finder and click the Go menu whilst holding down the Option (alt) key. Then go to:
Library >> Preferences
clear everything relating to LR5 which usually means deleting the following files:
Then re-launch Lightroom.
Are either of these files necessary at all for lightroom to operate??
When I trash those two files you mentioned, lightroom will not open unless I "register" my software with them. Is this what should be happening?
The prefs get automatically re-built on next launch.
If you are being asked for a serial number simply re-enter.
Did you mean Yosemite (OSX 10.10) or El capitan (OSX 10.11)?
Just checked, and I have read and write permissions on destination folders and in lightroom app.
Okay everyone, so I checked the permissions, trashed those two prefs files, and restarted lightroom when asked to reregister I'm guessing it views me as a new user...and none of my thousands of files are there. Yes, I can go to my time machine to the last backup...but, what did I do or not do to have this occur??
In your operating system, use the search feature to find all files whose name end with .LRCAT
Double-click on each one found until you find the catalog that has your photos.