My Windows laptop crashed while printing a photo, and I now get the message "LR encountered an error when reading from its preview cache and needs to quit." There are no options but to select ok and shut down the program. After multiple attempts to launce LR, I de-installed/installed the program again, and am getting the same error. Adobe gives me no options but to go to the forum (no phone or chat), so I'm hoping someone has seen this error before. Thanks.
Use your system browser (Windows Explorer or Finder depending on your operating system) to open the folder that contains your catalog. Locate the folder that has the extension .lrdata. It will have the same name as your catalog, but with a different extension. You need to delete that folder, and only that folder, and then you should be able to start Lightroom again. Lightroom will then begin building a new previews cache folder.