used by another user
This error message appears after Lightroom has crashed or has not been closed correctly.
When Lightroom is running, a temporary file is created that is named with the suffix .LOCK
When you close Lr correctly this xxxx.LOCK file is automatically deleted.
This xxxx.LOCK file is what prevents the catalog opening, and results in the error message preventing you from opening this catalog.
The remedy is to close Lightroom, locate your problem catalog (Portfolio 2....?) using the OS Finder/File Explorer, and delete the file that ends with .LOCK and restart Lightroom. (Your system must allow you to see file-type suffix!)
CAUTION: Do not delete the catalog file that ends with .LRCAT
The Adobe help page for this is-
Note- If you create a 'new' "Portofolio 3" catalog, it is a new empty catalog. Do not do this, instead follow the above advice to have "Portfolio 2" working.
Search your hard drive for a file that ends with .lock. Delete that file.
When LR crashed it left behind that Lock File which cause the Error used by another user. Once that file is deleted you will be able to open your original catalog file.
Thanks so much for the response. I was able to locate it however what would happen if did create the "3" will that override it when I open Lr or should I delete it?
If you have created a new catalog called "Portfolio 3", it will be empty unless you did some importing of photos into it.
It will be quite safe to use your operating system to delete the "Portfolio 3.LRCAT". Like an empty database, or a blank word document, there is no problem in deleting an empty catalog.
If you did any importing and editing in "Portfolio 3" then you would lose that work when deleted. But there is a way to combine the two catalogs (2 & 3) if necessary. If you moved or renamed files in "Portfolio 3" then you may need further advice to fix.
Thank you so much wobertc. I did import some photos but didn't get to editing so I'll go ahead and delete it.
Appreciate your help! Happy New Year