LRC won't open - says Catalog being used by another app

[arewenotmen]

Not sure why this has suddenly started happening when I try to open Lightroom Classic. Even when all other apps/programmes have been shut down I keep getting this error message and it refuses to open.

Running latest version of LRC on Win 10 Pro

Any help gratefully received!

[JohanElzenga · Accepted solution]

Look in your catalog folder for a file called "Catalogname.lrcat.lock". Lightroom creates this .lock file to prevent other apps opening the catalog at the same time, and deletes it on a normal quit. If the quit was not normal, that file remains and then prevents Lightroom itself to open the catalog. Delete it and your problem should be gone.

[arewenotmen]

Hi Johan,

Thanks very much for your quick reply. That seems to have done the trick 👍

Appreciate the help.

All the best, Rob.

[cayleys16163255]

But where do you find the catalog folders to delete this one?

[JohanElzenga]

But where do you find the catalog folders to delete this one?

By @cayleys16163255

I don't know where you store your catalog! The default location is a folder called 'Lightroom' in your 'Pictures' folder.