All Lightroom previews disappeared!

Question

I was editing a photo in the develop module when a popup occurred roughly saying LRC has encountered a problem with the Preview Cache File and it had to close.When I reopened LRC everything thing was blank. In the library module all was blank except for file name and EXIF dataClicking the development setting button in lower right corner open-end the image in the Develop module with the adjustments applied so images and edits are the I just can't see them.There are about 30,000 images in this Catalog from a recent trip of a Lifetime safari to Kenya with about half the images with preliminary edits.I am happy the pictures are there. I think they are all backed up to the cloud but if it is only a link to the previews that would save a lot of time.This forum has been a great help before.
LRC 15.0.1 Mac OS Tahoe 26.2

JohanElzenga · Accepted Answer

I already replied to this question in the LightroomQueen forums. For other people reading this:

- Delete 'catalogname previews.lrdata' from your catalog folder and start Lightroom again. Lightroom will rebuild it.

- Lightroom does not backup your pictures to the cloud, so make a local backup.

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