nikonlad wrote:
My computer crashed while Lightroom CC was open. After my system restarted, I tried to reload Lightroom, but got an error message "cannot open My Pictures catalog because a previous version is still open." To open Lightroom I need to create a new catalog, but I'll lose all my development adjustments and keywords; about five thousand!! How do I fix this?
Go to the folder where your Lightroom catalog is, look for a file with the same name, but a .lock extension, delete it. Lightroom should now open.