I can't open a catalogue because it says that another application already has it opened.

I am using Lightroom 4. I have been working on one catalogue & then switched to another. Everytime I try to open the first catalogue it say it is already open by another application. It is not open anywhere else. I have obviously rebooted my PC but the same error comes up. I can go to the backup of the catalogue, but I have done a lot of work on the images since then. Can someone please help?

With Lightroom closed down, use Explorer to browse to the folder that contains the catalog that you are trying to open. In that folder, alongside the catalog, should be a file that has the same name as the catalog with the addition of a ".lock" extension. This is the lock file that is created every time you open a catalog and is supposed to be deleted when you close that catalog. If it already exists when you try to open the catalog, you get the problem that you are experiencing. So, if that "lock" file is there, simply delete it (making absolutely certain you delete the file ending in ".lock" only). Then you should be able to start Lightroom and open that catalog.

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I aget a message that another application has the catolog open but I ahve no idea what has it open. Any idaes on how to figure out what program has it open?

This message is probably due to the fact that the so-called "lock-file" has not been deleted when you last exited Lr.
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I can't open a catalogue because it says that another application already has it opened.

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