Do you by any chance have your Catalog file on an external drive and using that drive with both the Macbook and the iMac?
Hi , thank you for your reply, and the answer is no.
“Cannot be opened because another has it opened”
This error message will be generated if there is a file present alongside the Catalog file with an extension .LOCK
Be aware that Lightroom creates this file when it opens a Catalog file. It is a temporary file that prevents any other user accessing the Catalog and it will delete automatically when Lightroom is exited normally. If Lightroom is closed unexpectedly e.g loss of power it will remain in place and prevent any further use of the Catalog.
The lock file you’ll be in the same folder as the Catalog file. Locate the .lock file and delete this file, then you can proceed normally.
Sorry but it’s not working
What is not working?
Did you locate a .lock file alongside your Catalog file?
I couldn’t locate the .lock file .
Which folder would it be located?
I searched the HD and couldn’t find it.
Thanks for your help . I know at the end it will work.
Sent from my iPad
On a Mac it would be in a sub-folder called Lightroom located in user (your name) / Pictures / Lightroom.
It will reside alongside the Catalog file which has an extension .lrcat It will carry the same name with the extensions .lrcat.lock.