light room has suddenly come up with an error message saying catalog invalid and the file size is showing 0 bytes what can I do
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This is obviously not your working catalog. Do a search, using your operating system's search feature, for all files whose name ends with .LRCAT. Double-click on each one you find to open it in Lightroom until you find the right one.
every other one I open is a lot older with a couple of them which are invalid and im stuck as I have lost a lot of work
Then you need to find a recent backup of your catalog file and open that.